Commit 2815a56e authored by Rik van Riel's avatar Rik van Riel Committed by Ingo Molnar
Browse files

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



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: default avatarDave Hansen <dave.hansen@intel.com>
Signed-off-by: default avatarRik van Riel <riel@surriel.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241114152723.1294686-3-riel@surriel.com
parent 209954cb

arch/x86/mm/tlb.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

		}

	}

include/linux/mm_types.h

+1 −0
Original line number Diff line number Diff line
@@ -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,

};