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Date: Mon, 17 Oct 2022 16:12:58 +0800 From: y00318929 <yeyunfeng@...wei.com> To: <catalin.marinas@....com>, <will@...nel.org>, <wangkefeng.wang@...wei.com>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <yeyunfeng@...wei.com> Subject: [PATCH 5/5] arm64: mm: Add TLB flush trace on context switch From: Yunfeng Ye <yeyunfeng@...wei.com> We do not know how many times the TLB is flushed on context switch. Adding trace_tlb_flush() in check_and_switch_context() may be useful. Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com> --- arch/arm64/mm/context.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c index 0ea3e7485ae7..eab470a97620 100644 --- a/arch/arm64/mm/context.c +++ b/arch/arm64/mm/context.c @@ -19,6 +19,8 @@ #include <asm/smp.h> #include <asm/tlbflush.h> +#include <trace/events/tlb.h> + struct asid_bitmap { unsigned long *map; unsigned long nr; @@ -60,6 +62,8 @@ static DEFINE_STATIC_KEY_FALSE(asid_isolation_enable); #define ctxid2asid(asid) ((asid) & ~ASID_MASK) #define asid2ctxid(asid, genid) ((asid) | (genid)) +#define TLB_FLUSH_ALL (-1) + /* Get the ASIDBits supported by the current CPU */ static u32 get_cpu_asid_bits(void) { @@ -416,8 +420,10 @@ void check_and_switch_context(struct mm_struct *mm) atomic64_set(&mm->context.id, asid); } - if (cpumask_test_and_clear_cpu(cpu, &tlb_flush_pending)) + if (cpumask_test_and_clear_cpu(cpu, &tlb_flush_pending)) { local_flush_tlb_all(); + trace_tlb_flush(TLB_FLUSH_ON_TASK_SWITCH, TLB_FLUSH_ALL); + } atomic64_set(this_cpu_ptr(&active_asids), asid); raw_spin_unlock_irqrestore(&cpu_asid_lock, flags); -- 2.27.0
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