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x86/mm/tlb: Add tracepoint for TLB flush IPI to stale CPU

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Add a tracepoint when we send a TLB flush IPI to a CPU that used
to be in the mm_cpumask, but isn't any more.

Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241114152723.1294686-3-riel@surriel.com
This commit is contained in:
Rik van Riel 2024-11-14 10:26:17 -05:00 committed by Ingo Molnar
parent 209954cbc7
commit 2815a56e4b
2 changed files with 2 additions and 0 deletions
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1
arch/x86/mm/tlb.c
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@ -760,6 +760,7 @@ static void flush_tlb_func(void *info)
/* Can only happen on remote CPUs */
if (f->mm && f->mm != loaded_mm) {
cpumask_clear_cpu(raw_smp_processor_id(), mm_cpumask(f->mm));
trace_tlb_flush(TLB_REMOTE_WRONG_CPU, 0);
return;
}
}

1
include/linux/mm_types.h
View File

@ -1335,6 +1335,7 @@ enum tlb_flush_reason {
TLB_LOCAL_SHOOTDOWN,
TLB_LOCAL_MM_SHOOTDOWN,
TLB_REMOTE_SEND_IPI,
TLB_REMOTE_WRONG_CPU,
NR_TLB_FLUSH_REASONS,
};