Commit dab5855b authored Jun 08, 2009 by Peter Zijlstra Committed by Ingo Molnar Jun 08, 2009

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@cs.helsinki.fi: move the hook to sys_mprotect() ]
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <Pine.LNX.4.64.0906082111030.12407@melkki.cs.Helsinki.FI>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 820a6442

mm/mprotect.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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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