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authorStanislaw Gruszka <sgruszka@redhat.com>2009-07-29 12:15:27 +0200
committerIngo Molnar <mingo@elte.hu>2009-08-03 14:48:35 +0200
commit8356b5f9c424e5831715abbce747197c30d1fd71 (patch)
tree87de74cc86f6eebf88eba9a4c335614787d984c5 /include/linux
parent42c4ab41a176ee784c0f28c0b29025a8fc34f05a (diff)
itimers: Fix periodic tics precision
Measure ITIMER_PROF and ITIMER_VIRT timers interval error between real ticks and requested by user. Take it into account when scheduling next tick. This patch introduce possibility where time between two consecutive tics is smaller then requested interval, it preserve however dependency that n tick is generated not earlier than n*interval time - counting from the beginning of periodic signal generation. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> LKML-Reference: <1248862529-6063-3-git-send-email-sgruszka@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3b3efaddd95..a069e65e8bb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -473,6 +473,8 @@ struct pacct_struct {
struct cpu_itimer {
cputime_t expires;
cputime_t incr;
+ u32 error;
+ u32 incr_error;
};
/**