From: Davidlohr Bueso <dave@stgolabs.net>
To: Raghavendra K T <raghavendra.kt@amd.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
gourry@gourry.net, nehagholkar@meta.com, abhishekd@meta.com,
david@redhat.com, ying.huang@intel.com, nphamcs@gmail.com,
akpm@linux-foundation.org, hannes@cmpxchg.org,
feng.tang@intel.com, kbusch@meta.com, bharata@amd.com,
Hasan.Maruf@amd.com, sj@kernel.org, willy@infradead.org,
kirill.shutemov@linux.intel.com, mgorman@techsingularity.net,
vbabka@suse.cz, hughd@google.com, rientjes@google.com,
shy828301@gmail.com, Liam.Howlett@Oracle.com,
peterz@infradead.org, mingo@redhat.com
Subject: Re: [RFC PATCH V0 0/10] mm: slowtier page promotion based on PTE A bit
Date: Wed, 12 Feb 2025 09:02:12 -0800 [thread overview]
Message-ID: <20250212170212.f5coa462p75fuqj6@offworld> (raw)
In-Reply-To: <20241201153818.2633616-1-raghavendra.kt@amd.com>
On Sun, 01 Dec 2024, Raghavendra K T wrote:
>6. Holding PTE lock before migration.
fyi I tried testing this series with 'perf-bench numa mem' and got a soft lockup,
unable to take the PTL (and lost the machine to debug further atm), ie:
[ 3852.217675] CPU: 127 UID: 0 PID: 12537 Comm: watch-numa-sche Tainted: G D L 6.14.0-rc2-kmmscand-v1+ #3
[ 3852.217677] Tainted: [D]=DIE, [L]=SOFTLOCKUP
[ 3852.217678] RIP: 0010:native_queued_spin_lock_slowpath+0x64/0x290
[ 3852.217683] Code: 77 7b f0 0f ba 2b 08 0f 92 c2 8b 03 0f b6 d2 c1 e2 08 30 e4 09 d0 3d ff 00 00 00 77 57 85 c0 74 10 0f b6 03 84 c0 74 09 f3 90 <0f> b6 03 84 c0 75 f7 b8 01 00 00 00 66 89 03 5b 5d 41 5c 41 5d c3
[ 3852.217684] RSP: 0018:ff274259b3c9f988 EFLAGS: 00000202
[ 3852.217685] RAX: 0000000000000001 RBX: ffbd2efd8c08c9a8 RCX: 000ffffffffff000
[ 3852.217686] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffbd2efd8c08c9a8
[ 3852.217687] RBP: ff161328422c1328 R08: ff274259b3c9fb90 R09: ff161328422c1000
[ 3852.217688] R10: 00000000ffffffff R11: 0000000000000004 R12: 00007f52cca00000
[ 3852.217688] R13: ff274259b3c9fa00 R14: ff16132842326000 R15: ff161328422c1328
[ 3852.217689] FS: 00007f32b6f92b80(0000) GS:ff161423bfd80000(0000) knlGS:0000000000000000
[ 3852.217691] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3852.217692] CR2: 0000564ddbf68008 CR3: 00000080a81cc005 CR4: 0000000000773ef0
[ 3852.217693] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3852.217694] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ 3852.217694] PKRU: 55555554
[ 3852.217695] Call Trace:
[ 3852.217696] <IRQ>
[ 3852.217697] ? watchdog_timer_fn+0x21b/0x2a0
[ 3852.217699] ? __pfx_watchdog_timer_fn+0x10/0x10
[ 3852.217702] ? __hrtimer_run_queues+0x10f/0x2a0
[ 3852.217704] ? hrtimer_interrupt+0xfb/0x240
[ 3852.217706] ? __sysvec_apic_timer_interrupt+0x4e/0x110
[ 3852.217709] ? sysvec_apic_timer_interrupt+0x68/0x90
[ 3852.217712] </IRQ>
[ 3852.217712] <TASK>
[ 3852.217713] ? asm_sysvec_apic_timer_interrupt+0x16/0x20
[ 3852.217717] ? native_queued_spin_lock_slowpath+0x64/0x290
[ 3852.217720] _raw_spin_lock+0x25/0x30
[ 3852.217723] __pte_offset_map_lock+0x9a/0x110
[ 3852.217726] gather_pte_stats+0x1e3/0x2c0
[ 3852.217730] walk_pgd_range+0x528/0xbb0
[ 3852.217733] __walk_page_range+0x71/0x1d0
[ 3852.217736] walk_page_vma+0x98/0xf0
[ 3852.217738] show_numa_map+0x11a/0x3a0
[ 3852.217741] seq_read_iter+0x2a6/0x470
[ 3852.217745] seq_read+0x12b/0x170
[ 3852.217748] vfs_read+0xe0/0x370
[ 3852.217751] ? syscall_exit_to_user_mode+0x49/0x210
[ 3852.217755] ? do_syscall_64+0x8a/0x190
[ 3852.217758] ksys_read+0x6a/0xe0
[ 3852.217762] do_syscall_64+0x7e/0x190
[ 3852.217765] ? __memcg_slab_free_hook+0xd4/0x120
[ 3852.217768] ? __x64_sys_close+0x38/0x80
[ 3852.217771] ? kmem_cache_free+0x3bf/0x3e0
[ 3852.217774] ? syscall_exit_to_user_mode+0x49/0x210
[ 3852.217777] ? do_syscall_64+0x8a/0x190
[ 3852.217780] ? do_syscall_64+0x8a/0x190
[ 3852.217783] ? __irq_exit_rcu+0x3e/0xe0
[ 3852.217785] entry_SYSCALL_64_after_hwframe+0x76/0x7e
next prev parent reply other threads:[~2025-02-12 17:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-01 15:38 Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 01/10] mm: Add kmmscand kernel daemon Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 02/10] mm: Maintain mm_struct list in the system Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 03/10] mm: Scan the mm and create a migration list Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 04/10] mm/migration: Migrate accessed folios to toptier node Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 05/10] mm: Add throttling of mm scanning using scan_period Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 06/10] mm: Add throttling of mm scanning using scan_size Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 07/10] sysfs: Add sysfs support to tune scanning Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 08/10] vmstat: Add vmstat counters Raghavendra K T
2024-12-01 15:38 ` [RFC PATCH V0 09/10] trace/kmmscand: Add tracing of scanning and migration Raghavendra K T
2024-12-05 17:46 ` Steven Rostedt
2024-12-06 6:33 ` Raghavendra K T
2024-12-06 14:49 ` Steven Rostedt
2024-12-01 15:38 ` [RFC PATCH V0 DO NOT MERGE 10/10] kmmscand: Add scanning Raghavendra K T
2024-12-10 18:53 ` [RFC PATCH V0 0/10] mm: slowtier page promotion based on PTE A bit SeongJae Park
2024-12-20 6:30 ` Raghavendra K T
2025-02-12 17:02 ` Davidlohr Bueso [this message]
2025-02-13 5:39 ` Raghavendra K T
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