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This= patch just adds the delay statistics of get_page_from_freelist() for memor= y reclaim, without many modifications.

Anyo= ne in particular I should cc to get this reviewed?

 

=B7=A2=BC=FE=C8=CB: =CE=C4=D3=EE <liwenyu01@bilibili.co= m>
=C8=D5=C6=DA: =D0=C7=C6=DA=C8=FD, 2023=C4=EA8=D4=C223= =C8=D5 17:54
=CA=D5=BC=FE=C8=CB: akpm@linux-foundation.org <akpm@linux-foundation.org>, linux-mm@kvac= k.org <linux-mm@kvack.org>
=B3=AD=CB=CD: linux-kernel@vger.kernel.org <linux-kernel@vger.kernel.org>, = =EFw= =D0=DC <wangyun@bilibili.com>, =CE=C4=D3=EE <liwenyu01@bilibili.co= m>
=D6=F7=CC=E2: [PATCH RFC] delayacct: add memory reclaim delay in get_page_from_freelist<= o:p>

The = current memory reclaim delay statistics only count the direct memory

recl= aim of the task in do_try_to_free_pages(). In systems with NUMA<= /span>

open= , some tasks occasionally experience slower response times, but the

tota= l count of reclaim does not increase, using ftrace can show that=

node= _reclaim has occurred.

&nbs= p;

The = memory reclaim occurring in get_page_from_freelist() is also due to

heav= y memory load. To get the impact of tasks in memory reclaim, this

patc= h adds the statistics of the memory reclaim delay statistics for=

__no= de_reclaim().

&nbs= p;

Sign= ed-off-by: Wen Yu Li <liwenyu01@bilibili.com>

---<= o:p>

mm/v= mscan.c | 2 ++

1 fi= le changed, 2 insertions(+)

&nbs= p;

diff= --git a/mm/vmscan.c b/mm/vmscan.c

inde= x 1080209a568b..d2471abce1ae 100644

--- = a/mm/vmscan.c

+++ = b/mm/vmscan.c

@@ -= 8010,6 +8010,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_= t gfp_mask, unsigned in

&nbs= p;

&nbs= p;       cond_resched();

&nbs= p;       psi_memstall_enter(&pflags);

+&nb= sp;      delayacct_freepages_start();

&nbs= p;       fs_reclaim_acquire(sc.gfp_mask);

&nbs= p;       /*

&nbs= p;        * We need to be able to alloca= te from the reserves for RECLAIM_UNMAP

@@ -= 8032,6 +8033,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_= t gfp_mask, unsigned in

&nbs= p;       memalloc_noreclaim_restore(noreclaim= _flag);

&nbs= p;       fs_reclaim_release(sc.gfp_mask);

&nbs= p;       psi_memstall_leave(&pflags);

+&nb= sp;      delayacct_freepages_end();

&nbs= p;

&nbs= p;       trace_mm_vmscan_node_reclaim_end(sc.= nr_reclaimed);

&nbs= p;

-- <= o:p>

2.30= .2

 

 

=B1=BE=D3=CA=BC=FE=BD=F6=CE=AA=D6=B8=B6=A8=CA=D5=BC=FE= =C8=CB=CA=B9=D3=C3=B2=A2=BF=C9=C4=DC=B0=FC=BA=AC=B1=A3=C3=DC=D0=C5=CF=A2=A3= =AC=C8=F4=C4=FA=CE=F3=CA=D5=B5=BD=B1=BE=D3=CA=BC=FE=A3=AC=BE=B4=C7=EB=CD=A8= =D6=AA=B7=A2=BC=FE=C8=CB=A3=AC=B2=A2=C1=A2=BC=B4=C9=BE=B3=FD=B1=BE=D3=CA=BC= =FE=BC=B0=CB=F9=D3=D0=B8=B1=B1=BE=A1=A3=C4=FA=B2=BB=B5=C3=C9=C3=D7=D4=B4=AB= =B2=A5=A1=A2=D7=AA=B7=A2=A1=A2=B1=A3=B4=E6=BB=F2=B8=B4=D6=C6=B4=CB=D3=CA=BC= =FE(=BA=AC=B8=BD=BC=FE)=A1=A3=B8=D0=D0=BB=C4=FA=B5=C4=C0=ED=BD=E2=D3=EB=C5= =E4=BA=CF=A1=A3

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