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oprofile: convert oprofile from timer_hook to hrtimer

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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>
This commit is contained in:
Martin Schwidefsky
2010-03-02 16:01:10 +01:00
committed by Robert Richter
parent cfc9c0b450
commit bc078e4eab
3 changed files with 81 additions and 16 deletions
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3
drivers/oprofile/oprof.h
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@@ -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);