The patch titled
oprofile: Add a special cookie for the VDSO region
has been added to the -mm tree. Its filename is
oprofile-add-a-special-cookie-for-the-vdso-region.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: oprofile: Add a special cookie for the VDSO region
From: "Amitabha Roy" <amitabha.roy@xxxxxxxxx>
Emit a special VDSO_COOKIE for VDSO regions instead of simply marking
them as anon.
So we can debug performance problems where a lot of time is spent in the VDSO
region (as an example frequent syscall restarts due to too many signals ?).
Signed-off-by: Amitabha Roy <amitabha.roy@xxxxxxxxx>
Cc: John Levon <levon@xxxxxxxxxxxxxxxxx>
Cc: Philippe Elie <phil.el@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/oprofile/buffer_sync.c | 9 ++++++++-
drivers/oprofile/event_buffer.h | 1 +
2 files changed, 9 insertions(+), 1 deletion(-)
diff -puN drivers/oprofile/buffer_sync.c~oprofile-add-a-special-cookie-for-the-vdso-region drivers/oprofile/buffer_sync.c
--- a/drivers/oprofile/buffer_sync.c~oprofile-add-a-special-cookie-for-the-vdso-region
+++ a/drivers/oprofile/buffer_sync.c
@@ -250,7 +250,14 @@ static unsigned long lookup_dcookie(stru
vma->vm_file->f_path.mnt);
*offset = (vma->vm_pgoff << PAGE_SHIFT) + addr -
vma->vm_start;
- } else {
+ }
+#ifdef CONFIG_X86_32
+ else if(mm->context.vdso==vma->vm_start){
+ cookie = VDSO_COOKIE;
+ *offset = addr;
+ }
+#endif
+ else {
/* must be an anonymous map */
*offset = addr;
}
diff -puN drivers/oprofile/event_buffer.h~oprofile-add-a-special-cookie-for-the-vdso-region drivers/oprofile/event_buffer.h
--- a/drivers/oprofile/event_buffer.h~oprofile-add-a-special-cookie-for-the-vdso-region
+++ a/drivers/oprofile/event_buffer.h
@@ -35,6 +35,7 @@ void wake_up_buffer_waiter(void);
#define TRACE_BEGIN_CODE 8
#define TRACE_END_CODE 9
+#define VDSO_COOKIE ~1UL
#define INVALID_COOKIE ~0UL
#define NO_COOKIE 0UL
_
Patches currently in -mm which might be from amitabha.roy@xxxxxxxxx are
oprofile-add-a-special-cookie-for-the-vdso-region.patch
-
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