linux-kernel - [tip:perfcounters/core] perf_counter: Add mmap event hooks to mprotect()

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Message-ID: <tip-dab5855b12411334355ba21349a06700e4ae7a3b@git.kernel.org>
Date:	Mon, 8 Jun 2009 21:33:28 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...hat.com, penberg@...helsinki.fi, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: Add mmap event hooks to mprotect()

Commit-ID:  dab5855b12411334355ba21349a06700e4ae7a3b
Gitweb:     http://git.kernel.org/tip/dab5855b12411334355ba21349a06700e4ae7a3b
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Mon, 8 Jun 2009 21:11:57 +0300
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 8 Jun 2009 23:10:43 +0200

perf_counter: Add mmap event hooks to mprotect()

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>
LKML-Reference: <Pine.LNX.4.64.0906082111030.12407@...kki.cs.Helsinki.FI>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 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)
--
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