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authorIngo Molnar <mingo@elte.hu>2007-10-16 10:09:20 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 13:01:50 -0400
commitf20bf6125605acbbc7eb8c9420d7221c91aa83eb (patch)
treece3dd753431dd32b346aa19f2f7b6bb84bb1f22e /kernel/time.c
parent8636225e8d23e6079d43f56faf415bd71b589dc0 (diff)
time: introduce xtime_seconds
improve performance of sys_time(). sys_time() returns time in seconds, but it does so by calling do_gettimeofday() and then returning the tv_sec portion of the GTOD time. But the data structure "xtime", which is updated by every timer/scheduler tick, already offers HZ granularity time. the patch improves the sysbench oltp macrobenchmark by 4-5% on an AMD dual-core system: v2.6.23: #threads 1: transactions: 4073 (407.23 per sec.) 2: transactions: 8530 (852.81 per sec.) 3: transactions: 8321 (831.88 per sec.) 4: transactions: 8407 (840.58 per sec.) 5: transactions: 8070 (806.74 per sec.) v2.6.23 + sys_time-speedup.patch: 1: transactions: 4281 (428.09 per sec.) 2: transactions: 8910 (890.85 per sec.) 3: transactions: 8659 (865.79 per sec.) 4: transactions: 8676 (867.34 per sec.) 5: transactions: 8532 (852.91 per sec.) and by 4-5% on an Intel dual-core system too: 2.6.23: 1: transactions: 4560 (455.94 per sec.) 2: transactions: 10094 (1009.30 per sec.) 3: transactions: 9755 (975.36 per sec.) 4: transactions: 9859 (985.78 per sec.) 5: transactions: 9701 (969.72 per sec.) 2.6.23 + sys_time-speedup.patch: 1: transactions: 4779 (477.84 per sec.) 2: transactions: 10103 (1010.14 per sec.) 3: transactions: 10141 (1013.93 per sec.) 4: transactions: 10371 (1036.89 per sec.) 5: transactions: 10178 (1017.50 per sec.) (the more CPUs the system has, the more speedup this patch gives for this particular workload.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/time.c')
-rw-r--r--kernel/time.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/kernel/time.c b/kernel/time.c
index 2289a8d68314..1afcc78dc3b1 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -57,11 +57,7 @@ EXPORT_SYMBOL(sys_tz);
57 */ 57 */
58asmlinkage long sys_time(time_t __user * tloc) 58asmlinkage long sys_time(time_t __user * tloc)
59{ 59{
60 time_t i; 60 time_t i = get_seconds();
61 struct timespec tv;
62
63 getnstimeofday(&tv);
64 i = tv.tv_sec;
65 61
66 if (tloc) { 62 if (tloc) {
67 if (put_user(i,tloc)) 63 if (put_user(i,tloc))