aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/posix-cpu-timers.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2009-01-26 12:47:43 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-26 12:47:43 -0500
commit1e70c7f7a9d4a3d2cc78b40e1d7768d99cd79899 (patch)
tree1218c32008412e57314f8f9db8d3b4912e2ecb25 /kernel/posix-cpu-timers.c
parent810ee58de26c9c1255d716b1db7344c4a1093fec (diff)
parent1d4a7f1c4faf53eb9e822743ec8a70b3019a26d2 (diff)
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: hrtimers: fix inconsistent lock state on resume in hres_timers_resume time-sched.c: tick_nohz_update_jiffies should be static locking, hpet: annotate false positive warning kernel/fork.c: unused variable 'ret' itimers: remove the per-cpu-ish-ness
Diffstat (limited to 'kernel/posix-cpu-timers.c')
-rw-r--r--kernel/posix-cpu-timers.c70
1 files changed, 0 insertions, 70 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 157de3a4783..fa07da94d7b 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -10,76 +10,6 @@
10#include <linux/kernel_stat.h> 10#include <linux/kernel_stat.h>
11 11
12/* 12/*
13 * Allocate the thread_group_cputime structure appropriately and fill in the
14 * current values of the fields. Called from copy_signal() via
15 * thread_group_cputime_clone_thread() when adding a second or subsequent
16 * thread to a thread group. Assumes interrupts are enabled when called.
17 */
18int thread_group_cputime_alloc(struct task_struct *tsk)
19{
20 struct signal_struct *sig = tsk->signal;
21 struct task_cputime *cputime;
22
23 /*
24 * If we have multiple threads and we don't already have a
25 * per-CPU task_cputime struct (checked in the caller), allocate
26 * one and fill it in with the times accumulated so far. We may
27 * race with another thread so recheck after we pick up the sighand
28 * lock.
29 */
30 cputime = alloc_percpu(struct task_cputime);
31 if (cputime == NULL)
32 return -ENOMEM;
33 spin_lock_irq(&tsk->sighand->siglock);
34 if (sig->cputime.totals) {
35 spin_unlock_irq(&tsk->sighand->siglock);
36 free_percpu(cputime);
37 return 0;
38 }
39 sig->cputime.totals = cputime;
40 cputime = per_cpu_ptr(sig->cputime.totals, smp_processor_id());
41 cputime->utime = tsk->utime;
42 cputime->stime = tsk->stime;
43 cputime->sum_exec_runtime = tsk->se.sum_exec_runtime;
44 spin_unlock_irq(&tsk->sighand->siglock);
45 return 0;
46}
47
48/**
49 * thread_group_cputime - Sum the thread group time fields across all CPUs.
50 *
51 * @tsk: The task we use to identify the thread group.
52 * @times: task_cputime structure in which we return the summed fields.
53 *
54 * Walk the list of CPUs to sum the per-CPU time fields in the thread group
55 * time structure.
56 */
57void thread_group_cputime(
58 struct task_struct *tsk,
59 struct task_cputime *times)
60{
61 struct task_cputime *totals, *tot;
62 int i;
63
64 totals = tsk->signal->cputime.totals;
65 if (!totals) {
66 times->utime = tsk->utime;
67 times->stime = tsk->stime;
68 times->sum_exec_runtime = tsk->se.sum_exec_runtime;
69 return;
70 }
71
72 times->stime = times->utime = cputime_zero;
73 times->sum_exec_runtime = 0;
74 for_each_possible_cpu(i) {
75 tot = per_cpu_ptr(totals, i);
76 times->utime = cputime_add(times->utime, tot->utime);
77 times->stime = cputime_add(times->stime, tot->stime);
78 times->sum_exec_runtime += tot->sum_exec_runtime;
79 }
80}
81
82/*
83 * Called after updating RLIMIT_CPU to set timer expiration if necessary. 13 * Called after updating RLIMIT_CPU to set timer expiration if necessary.
84 */ 14 */
85void update_rlimit_cpu(unsigned long rlim_new) 15void update_rlimit_cpu(unsigned long rlim_new)