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Commit dab5855b authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: default avatarPekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <Pine.LNX.4.64.0906082111030.12407@melkki.cs.Helsinki.FI>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 820a6442

mm/mprotect.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/swapops.h>

#include <linux/swapops.h>

#include <linux/mmu_notifier.h>

#include <linux/mmu_notifier.h>

#include <linux/migrate.h>

#include <linux/migrate.h>

#include <linux/perf_counter.h>

#include <asm/uaccess.h>

#include <asm/uaccess.h>

#include <asm/pgtable.h>

#include <asm/pgtable.h>

#include <asm/cacheflush.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);

		error = mprotect_fixup(vma, &prev, nstart, tmp, newflags);

		if (error)

		if (error)

			goto out;

			goto out;

		perf_counter_mmap(vma);

		nstart = tmp;

		nstart = tmp;





		if (nstart < prev->vm_end)

		if (nstart < prev->vm_end)