linux-kernel - [PATCH] x86/mm: TLB_REMOTE_SEND

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Message-Id: <1458740712-49402-1-git-send-email-namit@vmware.com>
Date:	Wed, 23 Mar 2016 06:45:12 -0700
From:	Nadav Amit <namit@...are.com>
To:	x86@...nel.org
Cc:	mgorman@...e.de, linux-kernel@...r.kernel.org,
	Nadav Amit <namit@...are.com>
Subject: [PATCH] x86/mm: TLB_REMOTE_SEND_IPI should count pages

TLB_REMOTE_SEND_IPI was recently introduced, but it counts bytes instead
of pages. In addition, it does not report correctly the case in which
flush_tlb_page flushes a page. Fix it to be consistent with other TLB
counters.

Fixes: 4595f9620cda8a1e973588e743cf5f8436dd20c6

Signed-off-by: Nadav Amit <namit@...are.com>
---
 arch/x86/mm/tlb.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 8f4cc3d..5fb6ada 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -106,8 +106,6 @@ static void flush_tlb_func(void *info)
 
 	if (f->flush_mm != this_cpu_read(cpu_tlbstate.active_mm))
 		return;
-	if (!f->flush_end)
-		f->flush_end = f->flush_start + PAGE_SIZE;
 
 	count_vm_tlb_event(NR_TLB_REMOTE_FLUSH_RECEIVED);
 	if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK) {
@@ -135,12 +133,20 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
 				 unsigned long end)
 {
 	struct flush_tlb_info info;
+
+	if (end == 0)
+		end = start + PAGE_SIZE;
 	info.flush_mm = mm;
 	info.flush_start = start;
 	info.flush_end = end;
 
 	count_vm_tlb_event(NR_TLB_REMOTE_FLUSH);
-	trace_tlb_flush(TLB_REMOTE_SEND_IPI, end - start);
+	if (end == TLB_FLUSH_ALL)
+		trace_tlb_flush(TLB_REMOTE_SEND_IPI, TLB_FLUSH_ALL);
+	else
+		trace_tlb_flush(TLB_REMOTE_SEND_IPI,
+				(end - start) >> PAGE_SHIFT);
+
 	if (is_uv_system()) {
 		unsigned int cpu;
 
-- 
2.5.0