linux-kernel - [PATCH 4/7] x86: mm: unify remote invlpg code

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Message-Id: <20140701164852.F61ED607@viggo.jf.intel.com>
Date:	Tue, 01 Jul 2014 09:48:52 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, x86@...nel.org, Dave Hansen <dave@...1.net>,
	dave.hansen@...ux.intel.com, riel@...hat.com, mgorman@...e.de
Subject: [PATCH 4/7] x86: mm: unify remote invlpg code


From: Dave Hansen <dave.hansen@...ux.intel.com>

There are currently three paths through the remote flush code:

1. full invalidation
2. single page invalidation using invlpg
3. ranged invalidation using invlpg

This takes 2 and 3 and combines them in to a single path by
making the single-page one just be the start and end be start
plus a single page.  This makes placement of our tracepoint easier.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Mel Gorman <mgorman@...e.de>
---

 b/arch/x86/mm/tlb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN arch/x86/mm/tlb.c~x86-tlb-simplify-remote-flush-code arch/x86/mm/tlb.c
--- a/arch/x86/mm/tlb.c~x86-tlb-simplify-remote-flush-code	2014-06-30 16:18:28.009559635 -0700
+++ b/arch/x86/mm/tlb.c	2014-06-30 16:18:28.013559817 -0700
@@ -102,13 +102,13 @@ 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) {
 		if (f->flush_end == TLB_FLUSH_ALL)
 			local_flush_tlb();
-		else if (!f->flush_end)
-			__flush_tlb_single(f->flush_start);
 		else {
 			unsigned long addr;
 			addr = f->flush_start;
_
--
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