linux-kernel - [PATCH 1/2] perf_counter: Add mmap event hooks to mprotect()

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Message-ID: <Pine.LNX.4.64.0906082111030.12407@melkki.cs.Helsinki.FI>
Date:	Mon, 8 Jun 2009 21:11:57 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	mingo@...e.hu
cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	acme@...hat.com
Subject: [PATCH 1/2] perf_counter: Add mmap event hooks to mprotect()

From: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Some JIT compilers allocate memory for generated code with
posix_memalign() + mprotect() so we need to hook into mprotect() to make
sure 'perf' is aware that we're executing code in anonymous memory.

[ penberg@...helsinki.fi: move the hook to sys_mprotect() ]
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 mm/mprotect.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 258197b..d80311b 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -23,6 +23,7 @@
 #include <linux/swapops.h>
 #include <linux/mmu_notifier.h>
 #include <linux/migrate.h>
+#include <linux/perf_counter.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/cacheflush.h>
@@ -299,6 +300,7 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
 		error = mprotect_fixup(vma, &prev, nstart, tmp, newflags);
 		if (error)
 			goto out;
+		perf_counter_mmap(vma);
 		nstart = tmp;
 
 		if (nstart < prev->vm_end)
-- 
1.5.6.3

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