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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, all I found a 300ms~600ms IRQ off when writing 1Gb data to mmc device at I.MX7d= SDB board at Linux-kernel-v6.14. But I test the same case at Linux-kernel-v6.7, this longest IRQ off time is= only 1ms~2ms. So the issue is introduced from v6.7~v6.14. Run this cmd to test: dd if=3D/dev/zero of=3D/dev/mmcblk2p4 bs=3D4096 seek=3D12500 count=3D256000= conv=3Dfsync This issue looks from blkdev_buffered_write() function. Because when I run = this cmd with "oflag=3Ddirect" to use blkdev_direct_write(), I can not see any long time IRQ off. Then I use Ftrace irqoff tracer to trace the longest IRQ off event, I found= some differences between v6.7 and v6.14: In iomap_file_buffered_write(), __folio_alloc (in v6.7) is replaced by _fol= io_alloc_noprof (in v6.14) by this patch. The spinlock disabled IRQ ~300ms+. It looks there are some fixes for this p= atch, but I still can see IRQ off 300ms+ at 6.14.0-rc7-next-20250319. Do I trigger one bug? I know little about mem so I have to report it and ho= pe I can get some help or guide. I put my ftrace log at the mail tail to help trace and explain. commit b951aaff503502a7fe066eeed2744ba8a6413c89 Author: Suren Baghdasaryan surenb@google.com Date: Thu Mar 21 09:36:40 2024 -0700 mm: enable page allocation tagging Redefine page allocators to record allocation tags upon their invocatio= n. Instrument post_alloc_hook and free_pages_prepare to modify current allocation tag. [surenb@google.com: undo _noprof additions in the documentation] Link: https://lkml.kernel.org/r/20240326231453.1206227-3-surenb@googl= e.com Link: https://lkml.kernel.org/r/20240321163705.3067592-19-surenb@google= .com Signed-off-by: Suren Baghdasaryan surenb@google.com Co-developed-by: Kent Overstreet kent.overstreet@linux.dev Signed-off-by: Kent Overstreet kent.overstreet@linux.dev Reviewed-by: Kees Cook keescook@chromium.org Tested-by: Kees Cook keescook@chromium.org Cc: Alexander Viro viro@zeniv.linux.org.uk Cc: Alex Gaynor alex.gaynor@gmail.com Cc: Alice Ryhl aliceryhl@google.com Cc: Andreas Hindborg a.hindborg@samsung.com Cc: Benno Lossin benno.lossin@proton.me Cc: "Bj=F6rn Roy Baron" bjorn3_gh@protonmail.com Cc: Boqun Feng boqun.feng@gmail.com Cc: Christoph Lameter cl@linux.com Cc: Dennis Zhou dennis@kernel.org Cc: Gary Guo gary@garyguo.net Cc: Miguel Ojeda ojeda@kernel.org Cc: Pasha Tatashin pasha.tatashin@soleen.com Cc: Peter Zijlstra peterz@infradead.org Cc: Tejun Heo tj@kernel.org Cc: Vlastimil Babka vbabka@suse.cz Cc: Wedson Almeida Filho wedsonaf@gmail.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Ftrace irqoff tracer shows detail: At v6.14: # tracer: irqsoff # # irqsoff latency trace v1.1.5 on 6.14.0-rc7-next-20250319 # -------------------------------------------------------------------- # latency: 279663 us, #21352/21352, CPU#0 | (M:NONE VP:0, KP:0, SP:0 HP:0 #= P:2) # ----------------- # | task: dd-805 (uid:0 nice:0 policy:0 rt_prio:0) # ----------------- # =3D> started at: __rmqueue_pcplist # =3D> ended at: _raw_spin_unlock_irqrestore # # # _------=3D> CPU# # / _-----=3D> irqs-off/BH-disabled # | / _----=3D> need-resched # || / _---=3D> hardirq/softirq # ||| / _--=3D> preempt-depth # |||| / _-=3D> migrate-disable # ||||| / delay # cmd pid |||||| time | caller # \ / |||||| \ | / dd-805 0d.... 1us : __rmqueue_pcplist dd-805 0d.... 3us : _raw_spin_trylock <-__rmqueue_pcplist dd-805 0d.... 7us : __mod_zone_page_state <-__rmqueue_pcplis= t dd-805 0d.... 10us : __mod_zone_page_state <-__rmqueue_pcplis= t dd-805 0d.... 12us : __mod_zone_page_state <-__rmqueue_pcplis= t dd-805 0d.... 15us : __mod_zone_page_state <-__rmqueue_pcplis= t dd-805 0d.... 17us : __mod_zone_page_state <-__rmqueue_pcplis= t dd-805 0d.... 19us : __mod_zone_page_state <-__rmqueue_pcplis= t ... dd-805 0d.... 1535us : find_suitable_fallback <-__rmqueue_pcpli= st dd-805 0d.... 1538us : find_suitable_fallback <-__rmqueue_pcpli= st dd-805 0d.... 1539us : find_suitable_fallback <-__rmqueue_pcpli= st dd-805 0d.... 1542us+: try_to_claim_block <-__rmqueue_pcplist dd-805 0d.... 1597us : find_suitable_fallback <-__rmqueue_pcpli= st dd-805 0d.... 1599us+: try_to_claim_block <-__rmqueue_pcplist dd-805 0d.... 1674us : find_suitable_fallback <-__rmqueue_pcpli= st dd-805 0d.... 1676us+: try_to_claim_block <-__rmqueue_pcplist dd-805 0d.... 1716us : find_suitable_fallback <-__rmqueue_pcpli= st dd-805 0d.... 1718us+: try_to_claim_block <-__rmqueue_pcplist dd-805 0d.... 1801us : find_suitable_fallback <-__rmqueue_pcpli= st dd-805 0d.... 1803us+: try_to_claim_block <-__rmqueue_pcplist ... dd-805 0d.... 279555us : find_suitable_fallback <-__rmqueue_pcpl= ist dd-805 0d.... 279556us : find_suitable_fallback <-__rmqueue_pcp= list dd-805 0d.... 279558us : find_suitable_fallback <-__rmqueue_pcp= list dd-805 0d.... 279560us+: try_to_claim_block <-__rmqueue_pcplist dd-805 0d.... 279616us : find_suitable_fallback <-__rmqueue_pcp= list dd-805 0d.... 279618us : __mod_zone_page_state <-__rmqueue_pcpl= ist dd-805 0d.... 279620us : find_suitable_fallback <-__rmqueue_pcp= list ... dd-805 0d.... 279658us : find_suitable_fallback <-__rmqueue_pcp= list dd-805 0d.... 279660us : _raw_spin_unlock_irqrestore <-__rmqueu= e_pcplist dd-805 0d.... 279662us : _raw_spin_unlock_irqrestore dd-805 0d.... 279666us+: trace_hardirqs_on <-_raw_spin_unlock_i= rqrestore dd-805 0d.... 279712us : =3D> get_page_from_freelist =3D> __alloc_frozen_pages_noprof =3D> __folio_alloc_noprof =3D> __filemap_get_folio =3D> iomap_write_begin =3D> iomap_file_buffered_write =3D> blkdev_write_iter =3D> vfs_write =3D> ksys_write =3D> ret_fast_syscall At v6.7: # tracer: irqsoff # # irqsoff latency trace v1.1.5 on 6.7.0 # -------------------------------------------------------------------- # latency: 2477 us, #146/146, CPU#0 | (M:server VP:0, KP:0, SP:0 HP:0 #P:2) # ----------------- # | task: dd-808 (uid:0 nice:0 policy:0 rt_prio:0) # ----------------- # =3D> started at: _raw_spin_lock_irqsave # =3D> ended at: _raw_spin_unlock_irqrestore # # # _------=3D> CPU# # / _-----=3D> irqs-off/BH-disabled # | / _----=3D> need-resched # || / _---=3D> hardirq/softirq # ||| / _--=3D> preempt-depth # |||| / _-=3D> migrate-disable # ||||| / delay # cmd pid |||||| time | caller # \ / |||||| \ | / dd-808 0d.... 1us!: _raw_spin_lock_irqsave dd-808 0d.... 186us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 189us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 191us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 192us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 194us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 196us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 199us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 203us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 330us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 332us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 334us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 336us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 338us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 339us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 341us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 343us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 479us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 481us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 483us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 485us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 486us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 488us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 490us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 492us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 630us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 632us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 634us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 636us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 638us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 640us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 642us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 644us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 771us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 773us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 775us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 777us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 778us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 780us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 782us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 784us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 911us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 913us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 915us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 916us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 918us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 920us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 922us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 924us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 1055us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1058us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1059us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1061us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1063us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1065us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1066us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 1068us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 1194us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1196us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1198us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1200us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1202us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1203us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1205us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 1208us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 1333us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1335us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1337us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1339us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1341us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1342us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1344us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 1346us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 1480us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1482us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1484us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1486us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1488us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1490us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1492us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 1494us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 1621us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1623us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1625us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1627us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1629us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1630us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1632us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 1634us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 1761us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1763us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1765us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1766us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1768us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1770us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1772us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 1774us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 1900us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1902us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1903us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1905us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1907us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1909us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 1911us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 1913us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 2038us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2040us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2042us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2044us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2046us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2047us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2049us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2051us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2053us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 2055us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 2175us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2176us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2178us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2180us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2182us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2183us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2185us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2187us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2189us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2191us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2192us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2194us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 2196us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 2323us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2325us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2327us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2328us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2330us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2332us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2334us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2335us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2337us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2339us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2341us : find_suitable_fallback <-__rmqueue_pcpli= st dd-808 0d.... 2343us : steal_suitable_fallback <-__rmqueue_pcpl= ist dd-808 0d.... 2345us!: move_freepages_block <-steal_suitable_fa= llback dd-808 0d.... 2470us : __mod_zone_page_state <-__rmqueue_pcplis= t dd-808 0d.... 2473us : _raw_spin_unlock_irqrestore <-__rmqueue_= pcplist dd-808 0d.... 2476us : _raw_spin_unlock_irqrestore dd-808 0d.... 2479us+: tracer_hardirqs_on <-_raw_spin_unlock_ir= qrestore dd-808 0d.... 2520us : =3D> get_page_from_freelist =3D> __alloc_pages =3D> __folio_alloc =3D> __filemap_get_folio =3D> iomap_write_begin =3D> iomap_file_buffered_write =3D> blkdev_write_iter =3D> vfs_write =3D> ksys_write =3D> ret_fast_syscall Best Regard Carlos Song --_000_VI2PR04MB11147C17A467F501A333073F4E8D82VI2PR04MB11147eu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi, all

 

I found a 300ms~600ms IRQ off w= hen writing 1Gb data to mmc device at I.MX7d SDB board at Linux-kernel-v6.1= 4.

But I test the same case at Lin= ux-kernel-v6.7, this longest IRQ off time is only 1ms~2ms. So the issue is = introduced from v6.7~v6.14.

 

Run this cmd to test:

dd if=3D/dev/zero of=3D/dev/mmc= blk2p4 bs=3D4096 seek=3D12500 count=3D256000 conv=3Dfsync=

 

This issue looks from blkdev_bu= ffered_write() function. Because when I run this cmd with “oflag=3Ddi= rect” to use

blkdev_direct_write(), I can no= t see any long time IRQ off.

 

Then I use Ftrace irqoff tracer= to trace the longest IRQ off event, I found some differences between v6.7 = and v6.14:

In iomap_file_buffered_write(),= __folio_alloc (in v6.7) is replaced by _folio_alloc_noprof (in v6.14) by t= his patch.

The spinlock disabled IRQ ~300m= s+. It looks there are some fixes for this patch, but I still can see IRQ o= ff 300ms+ at 6.14.0-rc7-next-20250319.

 

Do I trigger one bug? I know li= ttle about mem so I have to report it and hope I can get some help or guide= .

I put my ftrace log at the mail= tail to help trace and explain.

 

commit b951aaff503502a7fe066eee= d2744ba8a6413c89

Author: Suren Baghdasaryan surenb@google.com

Date:   Thu Mar 21 09= :36:40 2024 -0700

 

    mm: enable p= age allocation tagging

 

    Redefine pag= e allocators to record allocation tags upon their invocation.

    Instrument p= ost_alloc_hook and free_pages_prepare to modify current

    allocation t= ag.

 

    [surenb@goog= le.com: undo _noprof additions in the documentation]

      = Link: https://lkml.kernel.org/r/20240326231453.1206227-3-surenb@google.com

    Link: https://lkml.kernel.org/r/20240321163705.3067592-19-surenb@google.com

    Signed-off-b= y: Suren Baghdasaryan surenb@google.com

    Co-developed= -by: Kent Overstreet kent.overstreet@linux.dev

    Signed-off-b= y: Kent Overstreet kent.overstreet@linux.dev

    Reviewed-by:= Kees Cook keescook@chromium.org

    Tested-by: K= ees Cook keescook@chromium.org

    Cc: Alexande= r Viro viro@zeniv.linux.org.uk

    Cc: Alex Gay= nor alex.gaynor@gmail.com

    Cc: Alice Ry= hl aliceryhl@google.com

    Cc: Andreas = Hindborg a.hindborg@samsung.com

    Cc: Benno Lo= ssin benno.lossin@proton.me

    Cc: "Bj= =F6rn Roy Baron" bjorn3_gh@protonmail.com

    Cc: Boqun Fe= ng boqun.feng@gmail.com

    Cc: Christop= h Lameter cl@linux.com

    Cc: Dennis Z= hou dennis@kernel.org

    Cc: Gary Guo= gary@garyguo.net

    Cc: Miguel O= jeda ojeda@kernel.org

    Cc: Pasha Ta= tashin pasha.tatashin@soleen.com

    Cc: Peter Zi= jlstra peterz@infradead.org

    Cc: Tejun He= o tj@kernel.org

    Cc: Vlastimi= l Babka vbabka@suse.cz

    Cc: Wedson A= lmeida Filho wedsonaf@gmail.com

    Signed-off-b= y: Andrew Morton akpm@linux-foundation.org

 

 

Ftrace irqoff tracer shows deta= il:

At v6.14:

# tracer: irqsoff

#

# irqsoff latency trace v1.1.5 = on 6.14.0-rc7-next-20250319

# -----------------------------= ---------------------------------------

# latency: 279663 us, #21352/21= 352, CPU#0 | (M:NONE VP:0, KP:0, SP:0 HP:0 #P:2)

#    -----------= ------

#    | task: dd-= 805 (uid:0 nice:0 policy:0 rt_prio:0)

#    -----------= ------

#  =3D> started at: __r= mqueue_pcplist

#  =3D> ended at: =   _raw_spin_unlock_irqrestore

#

#

#     =             &nb= sp;  _------=3D> CPU#       &nbs= p;   

#     =             &nb= sp; / _-----=3D> irqs-off/BH-disabled

#     =              | = / _----=3D> need-resched   

#     =              ||= / _---=3D> hardirq/softirq

#     =              ||= | / _--=3D> preempt-depth  

#     =              ||= || / _-=3D> migrate-disable

#     =              ||= ||| /     delay      &nbs= p;   

#  cmd   &n= bsp; pid     |||||| time  |   caller&nbs= p;   

#     \&nbs= p;  /        ||||||  \ &n= bsp;  |    /      

     &= nbsp;dd-805       0d....    1u= s : __rmqueue_pcplist

      = dd-805       0d....    3us : _= raw_spin_trylock <-__rmqueue_pcplist

      = dd-805       0d....    7us : _= _mod_zone_page_state <-__rmqueue_pcplist

      = dd-805       0d....   10us : __mod_= zone_page_state <-__rmqueue_pcplist

      = dd-805       0d....   12us : __mod_= zone_page_state <-__rmqueue_pcplist

      = dd-805       0d....   15us : __mod_= zone_page_state <-__rmqueue_pcplist

      = dd-805       0d....   17us : __mod_= zone_page_state <-__rmqueue_pcplist

      = dd-805       0d....   19us : __mod_= zone_page_state <-__rmqueue_pcplist

   …=

      = dd-805       0d.... 1535us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-805       0d.... 1538us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-805       0d.... 1539us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-805       0d.... 1542us+: try_to_claim_blo= ck <-__rmqueue_pcplist

      = dd-805       0d.... 1597us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-805       0d.... 1599us+: try_to_claim_blo= ck <-__rmqueue_pcplist

      = dd-805       0d.... 1674us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-805       0d.... 1676us+: try_to_claim_blo= ck <-__rmqueue_pcplist

      = dd-805       0d.... 1716us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-805       0d.... 1718us+: try_to_claim_blo= ck <-__rmqueue_pcplist

      = dd-805       0d.... 1801us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-805       0d.... 1803us+: try_to_claim_blo= ck <-__rmqueue_pcplist

…

     dd-805=        0d.... 279555us : find_suitable_fallba= ck <-__rmqueue_pcplist

      = dd-805       0d.... 279556us : find_suitable_= fallback <-__rmqueue_pcplist

      = dd-805       0d.... 279558us : find_suitable_= fallback <-__rmqueue_pcplist

      = dd-805       0d.... 279560us+: try_to_claim_b= lock <-__rmqueue_pcplist

      = dd-805       0d.... 279616us : find_suitable_= fallback <-__rmqueue_pcplist

      = dd-805       0d.... 279618us : __mod_zone_pag= e_state <-__rmqueue_pcplist

      = dd-805       0d.... 279620us : find_suitable_= fallback <-__rmqueue_pcplist

…

      = dd-805       0d.... 279658us : find_suitable_= fallback <-__rmqueue_pcplist

      = dd-805       0d.... 279660us : _raw_spin_unlo= ck_irqrestore <-__rmqueue_pcplist

      = dd-805       0d.... 279662us : _raw_spin_unlo= ck_irqrestore

      = dd-805       0d.... 279666us+: trace_hardirqs= _on <-_raw_spin_unlock_irqrestore

      = dd-805       0d.... 279712us : <stack trac= e>

=3D> get_page_from_freelist<= o:p>

=3D> __alloc_frozen_pages_no= prof

=3D> __folio_alloc_noprof

=3D> __filemap_get_folio

=3D> iomap_write_begin<= /o:p>

=3D> iomap_file_buffered_wri= te

=3D> blkdev_write_iter<= /o:p>

=3D> vfs_write

=3D> ksys_write

=3D> ret_fast_syscall

 

At v6.7:

# tracer: irqsoff

#

# irqsoff latency trace v1.1.5 = on 6.7.0

# -----------------------------= ---------------------------------------

# latency: 2477 us, #146/146, C= PU#0 | (M:server VP:0, KP:0, SP:0 HP:0 #P:2)

#    -----------= ------

#    | task: dd-= 808 (uid:0 nice:0 policy:0 rt_prio:0)

#    -----------= ------

#  =3D> started at: _ra= w_spin_lock_irqsave

#  =3D> ended at: =   _raw_spin_unlock_irqrestore

#

#

#     =             &nb= sp;  _------=3D> CPU#       &nbs= p;   

#     =             &nb= sp; / _-----=3D> irqs-off/BH-disabled

#     =              | = / _----=3D> need-resched   

#     =              ||= / _---=3D> hardirq/softirq

#     =              ||= | / _--=3D> preempt-depth  

#     =              ||= || / _-=3D> migrate-disable

#     =              ||= ||| /     delay      &nbs= p;   

#  cmd   &n= bsp; pid     |||||| time  |   caller&nbs= p;   

#     \&nbs= p;  /        ||||||  \ &n= bsp;  |    /      

     &= nbsp;dd-808       0d....    1u= s!: _raw_spin_lock_irqsave

      = dd-808       0d....  186us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  189us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  191us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  192us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  194us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  196us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  199us : steal_suita= ble_fallback <-__rmqueue_pcplist

      = dd-808       0d....  203us!: move_freepa= ges_block <-steal_suitable_fallback

      = dd-808       0d....  330us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  332us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  334us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  336us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  338us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  339us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  341us : steal_suita= ble_fallback <-__rmqueue_pcplist

      = dd-808       0d....  343us!: move_freepa= ges_block <-steal_suitable_fallback

      = dd-808       0d....  479us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  481us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  483us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  485us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  486us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  488us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  490us : steal_suita= ble_fallback <-__rmqueue_pcplist

      = dd-808       0d....  492us!: move_freepa= ges_block <-steal_suitable_fallback

      = dd-808       0d....  630us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  632us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  634us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  636us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  638us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  640us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  642us : steal_suita= ble_fallback <-__rmqueue_pcplist

      = dd-808       0d....  644us!: move_freepa= ges_block <-steal_suitable_fallback

      = dd-808       0d....  771us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  773us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  775us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  777us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  778us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  780us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  782us : steal_suita= ble_fallback <-__rmqueue_pcplist

      = dd-808       0d....  784us!: move_freepa= ges_block <-steal_suitable_fallback

      = dd-808       0d....  911us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  913us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  915us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  916us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  918us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  920us : find_suitab= le_fallback <-__rmqueue_pcplist

      = dd-808       0d....  922us : steal_suita= ble_fallback <-__rmqueue_pcplist

      = dd-808       0d....  924us!: move_freepa= ges_block <-steal_suitable_fallback

      = dd-808       0d.... 1055us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1058us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1059us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1061us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1063us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1065us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1066us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 1068us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 1194us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1196us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1198us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1200us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1202us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1203us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1205us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 1208us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 1333us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1335us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1337us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1339us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1341us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1342us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1344us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 1346us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 1480us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1482us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1484us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1486us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1488us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1490us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1492us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 1494us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 1621us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1623us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1625us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1627us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1629us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1630us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1632us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 1634us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 1761us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1763us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1765us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1766us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1768us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1770us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1772us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 1774us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 1900us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1902us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1903us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1905us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1907us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1909us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 1911us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 1913us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 2038us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2040us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2042us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2044us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2046us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2047us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2049us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2051us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2053us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 2055us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 2175us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2176us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2178us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2180us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2182us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2183us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2185us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2187us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2189us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2191us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2192us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2194us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 2196us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 2323us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2325us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2327us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2328us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2330us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2332us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2334us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2335us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2337us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2339us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2341us : find_suitable_fa= llback <-__rmqueue_pcplist

      = dd-808       0d.... 2343us : steal_suitable_f= allback <-__rmqueue_pcplist

      = dd-808       0d.... 2345us!: move_freepages_b= lock <-steal_suitable_fallback

      = dd-808       0d.... 2470us : __mod_zone_page_= state <-__rmqueue_pcplist

      = dd-808       0d.... 2473us : _raw_spin_unlock= _irqrestore <-__rmqueue_pcplist

      = dd-808       0d.... 2476us : _raw_spin_unlock= _irqrestore

      = dd-808       0d.... 2479us+: tracer_hardirqs_= on <-_raw_spin_unlock_irqrestore

      = dd-808       0d.... 2520us : <stack trace&= gt;

=3D> get_page_from_freelist<= o:p>

=3D> __alloc_pages

=3D> __folio_alloc

=3D> __filemap_get_folio

=3D> iomap_write_begin<= /o:p>

=3D> iomap_file_buffered_wri= te

=3D> blkdev_write_iter<= /o:p>

=3D> vfs_write

=3D> ksys_write

=3D> ret_fast_syscall

 

Best Regard=

Carlos Song=

 

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