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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2010-03-02 16:01:10 +0100 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2010-03-02 17:03:20 +0100 |
| commit | bc078e4eab65f11bbaeed380593ab8151b30d703 (patch) | |
| tree | 8d61457355fad4e5b5938cd7c01a1dd379778789 /drivers/oprofile/oprof.h | |
| parent | cfc9c0b450176a077205ef39092f0dc1a04e020a (diff) | |
| download | lwn-bc078e4eab65f11bbaeed380593ab8151b30d703.tar.gz lwn-bc078e4eab65f11bbaeed380593ab8151b30d703.zip | |
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@de.ibm.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'drivers/oprofile/oprof.h')
| -rw-r--r-- | drivers/oprofile/oprof.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/oprofile/oprof.h b/drivers/oprofile/oprof.h index cb92f5c98c1a..47e12cb4ee8b 100644 --- a/drivers/oprofile/oprof.h +++ b/drivers/oprofile/oprof.h @@ -34,7 +34,8 @@ struct super_block; struct dentry; void oprofile_create_files(struct super_block *sb, struct dentry *root); -void oprofile_timer_init(struct oprofile_operations *ops); +int oprofile_timer_init(struct oprofile_operations *ops); +void oprofile_timer_exit(void); int oprofile_set_backtrace(unsigned long depth); int oprofile_set_timeout(unsigned long time); |