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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-02-05 06:24:16 -0500
committerIngo Molnar <mingo@elte.hu>2009-02-05 07:04:33 -0500
commit4cd4c1b40d40447fb5e7ba80746c6d7ba91d7a53 (patch)
treeb1e580d5284648d6884e951d995509094a92cca4 /include/linux/init_task.h
parent32bd671d6cbeda60dc73be77fa2b9037d9a9bfa0 (diff)
timers: split process wide cpu clocks/timers
Change the process wide cpu timers/clocks so that we: 1) don't mess up the kernel with too many threads, 2) don't have a per-cpu allocation for each process, 3) have no impact when not used. In order to accomplish this we're going to split it into two parts: - clocks; which can take all the time they want since they run from user context -- ie. sys_clock_gettime(CLOCK_PROCESS_CPUTIME_ID) - timers; which need constant time sampling but since they're explicity used, the user can pay the overhead. The clock readout will go back to a full sum of the thread group, while the timers will run of a global 'clock' that only runs when needed, so only programs that make use of the facility pay the price. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/init_task.h')
-rw-r--r--include/linux/init_task.h11
1 files changed, 5 insertions, 6 deletions
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index ea0ea1a4c36f..e752d973fa21 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -48,12 +48,11 @@ extern struct fs_struct init_fs;
48 .posix_timers = LIST_HEAD_INIT(sig.posix_timers), \ 48 .posix_timers = LIST_HEAD_INIT(sig.posix_timers), \
49 .cpu_timers = INIT_CPU_TIMERS(sig.cpu_timers), \ 49 .cpu_timers = INIT_CPU_TIMERS(sig.cpu_timers), \
50 .rlim = INIT_RLIMITS, \ 50 .rlim = INIT_RLIMITS, \
51 .cputime = { .totals = { \ 51 .cputimer = { \
52 .utime = cputime_zero, \ 52 .cputime = INIT_CPUTIME, \
53 .stime = cputime_zero, \ 53 .running = 0, \
54 .sum_exec_runtime = 0, \ 54 .lock = __SPIN_LOCK_UNLOCKED(sig.cputimer.lock), \
55 .lock = __SPIN_LOCK_UNLOCKED(sig.cputime.totals.lock), \ 55 }, \
56 }, }, \
57} 56}
58 57
59extern struct nsproxy init_nsproxy; 58extern struct nsproxy init_nsproxy;