From: Robert Richter on

please pull oprofile updates from:

git:// core

You might want to pull from 'for-next' instead that includes an
additional merge with tip/tracing/core to resolve conflicts with that




commit b971f06187d83b5c03d2b597cccdfef421c0ca91
Merge: cb6e943 c1ab9ca
Author: Robert Richter <robert.richter(a)>
Date: Fri Apr 23 16:47:51 2010 +0200

Merge commit 'tip/tracing/core' into oprofile/core


Signed-off-by: Robert Richter <robert.richter(a)>

commit cb6e943ccf19ab6d3189147e9d625a992e016084
Author: Andi Kleen <andi(a)>
Date: Thu Apr 1 03:17:25 2010 +0200

oprofile: remove double ring buffering

oprofile used a double buffer scheme for its cpu event buffer
to avoid races on reading with the old locked ring buffer.

But that is obsolete now with the new ring buffer, so simply
use a single buffer. This greatly simplifies the code and avoids
a lot of sample drops on large runs, especially with call graph.

Based on suggestions from Steven Rostedt

For stable kernels from v2.6.32, but not earlier.

Signed-off-by: Andi Kleen <ak(a)>
Cc: Steven Rostedt <rostedt(a)>
Cc: stable <stable(a)>
Signed-off-by: Robert Richter <robert.richter(a)>

commit a36bf32e9e8a86f291f746b7f8292e042ee04a46
Merge: bc078e4 01bf0b6
Author: Robert Richter <robert.richter(a)>
Date: Fri Apr 23 14:30:22 2010 +0200

Merge commit 'v2.6.34-rc5' into oprofile/core

commit bc078e4eab65f11bbaeed380593ab8151b30d703
Author: Martin Schwidefsky <schwidefsky(a)>
Date: Tue Mar 2 16:01:10 2010 +0100

oprofile: convert oprofile from timer_hook to hrtimer

Oprofile is currently broken on systems running with NOHZ enabled.
A maximum of 1 tick is accounted via the timer_hook if a cpu sleeps
for a longer period of time. This does bad things to the percentages
in the profiler output. To solve this problem convert oprofile to
use a restarting hrtimer instead of the timer_hook.

Signed-off-by: Martin Schwidefsky <schwidefsky(a)>
Signed-off-by: Robert Richter <robert.richter(a)>

Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter(a)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)
More majordomo info at
Please read the FAQ at