From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>, Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
John Stultz <john.stultz@linaro.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Anna-Maria Behnsen <anna-maria@linutronix.de>
Subject: [patch 37/44] posix-cpu-timers: Consolidate timer expiry further
Date: Mon, 19 Aug 2019 16:32:18 +0200 [thread overview]
Message-ID: <20190819143804.931754993@linutronix.de> (raw)
In-Reply-To: 20190819143141.221906747@linutronix.de
With the array based samples and expiry cache, the expiry function can use
a loop to collect timers from the clock specific lists.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/time/posix-cpu-timers.c | 48 +++++++++++++++++++++--------------------
1 file changed, 25 insertions(+), 23 deletions(-)
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -746,6 +746,17 @@ check_timers_list(struct list_head *time
return U64_MAX;
}
+static void collect_posix_cputimers(struct posix_cputimers *pct,
+ u64 *samples, struct list_head *firing)
+{
+ struct list_head *timers = pct->cpu_timers;
+ u64 *expiries = pct->expiries;
+ int i;
+
+ for (i = 0; i < CPUCLOCK_MAX; i++, timers++)
+ expiries[i] = check_timers_list(timers, firing, samples[i]);
+}
+
static inline void check_dl_overrun(struct task_struct *tsk)
{
if (tsk->dl.dl_overrun) {
@@ -762,21 +773,18 @@ static inline void check_dl_overrun(stru
static void check_thread_timers(struct task_struct *tsk,
struct list_head *firing)
{
- struct list_head *timers = tsk->posix_cputimers.cpu_timers;
- u64 stime, utime, *expires = tsk->posix_cputimers.expiries;
+ struct posix_cputimers *pct = &tsk->posix_cputimers;
+ u64 samples[CPUCLOCK_MAX];
unsigned long soft;
if (dl_task(tsk))
check_dl_overrun(tsk);
- if (expiry_cache_is_inactive(tsk->posix_cputimers.expiries))
+ if (expiry_cache_is_inactive(pct->expiries))
return;
- task_cputime(tsk, &utime, &stime);
-
- *expires++ = check_timers_list(timers, firing, utime + stime);
- *expires++ = check_timers_list(++timers, firing, utime);
- *expires = check_timers_list(++timers, firing, tsk->se.sum_exec_runtime);
+ task_sample_cputime(tsk, samples);
+ collect_posix_cputimers(pct, samples, firing);
/*
* Check for the special case thread timers.
@@ -815,7 +823,7 @@ static void check_thread_timers(struct t
}
}
- if (expiry_cache_is_inactive(tsk->posix_cputimers.expiries))
+ if (expiry_cache_is_inactive(pct->expiries))
tick_dep_clear_task(tsk, TICK_DEP_BIT_POSIX_TIMER);
}
@@ -859,15 +867,15 @@ static void check_process_timers(struct
struct list_head *firing)
{
struct signal_struct *const sig = tsk->signal;
- struct list_head *timers = sig->posix_cputimers.cpu_timers;
- u64 virt_exp, prof_exp, sched_exp, samples[CPUCLOCK_MAX];
+ struct posix_cputimers *pct = &sig->posix_cputimers;
+ u64 samples[CPUCLOCK_MAX], *exp = pct->expiries;
unsigned long soft;
/*
* If cputimer is not running, then there are no active
* process wide timers (POSIX 1.b, itimers, RLIMIT_CPU).
*/
- if (!READ_ONCE(tsk->signal->cputimer.running))
+ if (!READ_ONCE(sig->cputimer.running))
return;
/*
@@ -881,17 +889,14 @@ static void check_process_timers(struct
* so the sample can be taken directly.
*/
proc_sample_cputime_atomic(&sig->cputimer.cputime_atomic, samples);
-
- prof_exp = check_timers_list(timers, firing, samples[CPUCLOCK_PROF]);
- virt_exp = check_timers_list(++timers, firing, samples[CPUCLOCK_VIRT]);
- sched_exp = check_timers_list(++timers, firing, samples[CPUCLOCK_SCHED]);
+ collect_posix_cputimers(pct, samples, firing);
/*
* Check for the special case process timers.
*/
- check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], &prof_exp,
+ check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], &exp[CPUCLOCK_PROF],
samples[CPUCLOCK_PROF], SIGPROF);
- check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_exp,
+ check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &exp[CPUCLOCK_VIRT],
samples[CPUCLOCK_VIRT], SIGVTALRM);
soft = task_rlimit(tsk, RLIMIT_CPU);
@@ -927,13 +932,10 @@ static void check_process_timers(struct
}
}
softns = soft * NSEC_PER_SEC;
- if (softns < prof_exp)
- prof_exp = softns;
+ if (softns < exp[CPUCLOCK_PROF])
+ exp[CPUCLOCK_PROF] = softns;
}
- store_samples(sig->posix_cputimers.expiries, prof_exp, virt_exp,
- sched_exp);
-
if (expiry_cache_is_inactive(sig->posix_cputimers.expiries))
stop_process_timers(sig);
next prev parent reply other threads:[~2019-08-19 15:46 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-19 14:31 [patch 00/44] posix-cpu-timers: Cleanup and consolidation Thomas Gleixner
2019-08-19 14:31 ` [patch 01/44] posix-timers: Cleanup forward declarations and includes Thomas Gleixner
2019-08-20 12:20 ` Frederic Weisbecker
2019-08-20 13:03 ` Thomas Gleixner
2019-08-20 13:48 ` Frederic Weisbecker
2019-08-23 2:12 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2019-08-19 14:31 ` [patch 02/44] alarmtimers: Avoid rtc.h include Thomas Gleixner
2019-08-20 13:49 ` Frederic Weisbecker
2019-08-23 2:12 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2019-08-19 14:31 ` [patch 03/44] posix-timer: Use a callback for cancel synchronization Thomas Gleixner
2019-08-20 2:21 ` Christoph Hellwig
2019-08-20 13:08 ` Thomas Gleixner
2019-08-20 13:59 ` Frederic Weisbecker
2019-08-23 2:12 ` [tip: timers/core] posix-timers: Use a callback for cancel synchronization on PREEMPT_RT tip-bot2 for Thomas Gleixner
2019-08-19 14:31 ` [patch 04/44] posix-cpu-timers: Fixup stale comment Thomas Gleixner
2019-08-20 14:26 ` Frederic Weisbecker
2019-08-20 17:57 ` Thomas Gleixner
2019-08-20 20:48 ` Frederic Weisbecker
2019-08-20 21:43 ` Thomas Gleixner
2019-08-20 22:56 ` Frederic Weisbecker
2019-08-21 13:31 ` Thomas Gleixner
2019-08-21 15:51 ` Frederic Weisbecker
2019-08-23 2:12 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2019-08-19 14:31 ` [patch 05/44] posix-cpu-timers: Sanitize bogus WARNONS Thomas Gleixner
2019-08-21 11:34 ` Frederic Weisbecker
2019-08-23 2:12 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2019-08-19 14:31 ` [patch 06/44] posix-cpu-timers: Remove tsk argument from run_posix_cpu_timers() Thomas Gleixner
2019-08-21 11:36 ` Frederic Weisbecker
2019-08-23 2:12 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2019-08-19 14:31 ` [patch 07/44] posix-cpu-timers: Simplify sighand locking in run_posix_cpu_timers() Thomas Gleixner
2019-08-21 12:09 ` Frederic Weisbecker
2019-08-21 13:25 ` Thomas Gleixner
2019-08-21 15:42 ` Frederic Weisbecker
2019-08-21 17:13 ` Thomas Gleixner
2019-08-19 14:31 ` [patch 08/44] posix-cpu-timers: Provide task validation functions Thomas Gleixner
2019-08-19 14:31 ` [patch 09/44] posix-cpu-timers: Use common permission check in posix_cpu_clock_get() Thomas Gleixner
2019-08-19 14:31 ` [patch 10/44] posix-cpu-timers: Use common permission check in posix_cpu_timer_create() Thomas Gleixner
2019-08-19 14:31 ` [patch 11/44] posix-cpu-timers: Provide quick sample function for itimer Thomas Gleixner
2019-08-19 14:31 ` [patch 12/44] itimers: Use quick sample function Thomas Gleixner
2019-08-19 14:31 ` [patch 13/44] posix-cpu-timers: Sample directly in timer check Thomas Gleixner
2019-08-19 14:31 ` [patch 14/44] posix-cpu-timers: Rename thread_group_cputimer() and make it static Thomas Gleixner
2019-08-19 14:31 ` [patch 15/44] posix-cpu-timer: Comsolidate thread group sample code Thomas Gleixner
2019-08-19 19:07 ` Ingo Molnar
2019-08-19 14:31 ` [patch 16/44] posix-cpu-timers: Use clock ID in posix_cpu_timer_set() Thomas Gleixner
2019-08-19 14:31 ` [patch 17/44] posix-cpu-timers: Use clock ID in posix_cpu_timer_get() Thomas Gleixner
2019-08-19 14:31 ` [patch 18/44] posix-cpu-timers: Use clock ID in posix_cpu_timer_rearm() Thomas Gleixner
2019-08-19 14:32 ` [patch 19/44] posix-cpu-timer: Remove pointless return value check Thomas Gleixner
2019-08-19 14:32 ` [patch 20/44] posix-cpu-timers: Simplify sample functions Thomas Gleixner
2019-08-19 14:32 ` [patch 21/44] posix-cpu-timers: Get rid of pointer indirection Thomas Gleixner
2019-08-19 14:32 ` [patch 22/44] posix-cpu-timers: Sample task times once in expiry check Thomas Gleixner
2019-08-19 14:32 ` [patch 23/44] posix-cpu-timers: Move prof/virt_ticks into caller Thomas Gleixner
2019-08-19 14:32 ` [patch 24/44] posix-cpu-timers: Create a container struct Thomas Gleixner
2019-08-19 14:32 ` [patch 25/44] sched: Move struct task_cputime to types.h Thomas Gleixner
2019-08-19 14:32 ` [patch 26/44] posix-cpu-timers: Move expiry cache into struct posix_cputimers Thomas Gleixner
2019-08-19 14:32 ` [patch 27/44] posix-cpu-timers: Provide array based access to expiry cache Thomas Gleixner
2019-08-19 19:32 ` Ingo Molnar
2019-08-20 20:22 ` Thomas Gleixner
2019-08-19 14:32 ` [patch 28/44] posix-cpu-timers: Simplify timer queueing Thomas Gleixner
2019-08-19 14:32 ` [patch 29/44] posix-cpu-timers: Simplify set_process_cpu_timer() Thomas Gleixner
2019-08-19 14:32 ` [patch 30/44] posix-cpu-timers: Switch check_*_timers() to array cache Thomas Gleixner
2019-08-19 14:32 ` [patch 31/44] posix-cpu-timers: Remove the odd field rename defines Thomas Gleixner
2019-08-19 14:32 ` [patch 32/44] posix-cpu-timers: Provide array based sample functions Thomas Gleixner
2019-08-19 14:32 ` [patch 33/44] posix-cpu-timers: Make expiry checks array based Thomas Gleixner
2019-08-19 14:32 ` [patch 34/44] posix-cpu-timers: Remove cputime_expires Thomas Gleixner
2019-08-19 14:32 ` [patch 35/44] posix-cpu-timers: Switch thread group sampling to array Thomas Gleixner
2019-08-19 14:32 ` [patch 36/44] posix-cpu-timers: Get rid of zero checks Thomas Gleixner
2019-08-19 14:32 ` Thomas Gleixner [this message]
2019-08-19 14:32 ` [patch 38/44] posix-cpu-timers: Respect INFINITY for hard RTTIME limit Thomas Gleixner
2019-08-19 20:06 ` Ingo Molnar
2019-08-19 20:29 ` Thomas Gleixner
2019-08-19 14:32 ` [patch 39/44] posix-cpu-timers: Get rid of 64bit divisions Thomas Gleixner
2019-08-19 14:32 ` [patch 40/44] posix-cpu-timers: Remove pointless comparisions Thomas Gleixner
2019-08-19 20:10 ` Ingo Molnar
2019-08-19 14:32 ` [patch 41/44] posix-cpu-timers: Deduplicate rlimit handling Thomas Gleixner
2019-08-19 14:32 ` [patch 42/44] posix-cpu-timers: Move state tracking to struct posix_cputimers Thomas Gleixner
2019-08-19 19:13 ` Ingo Molnar
2019-08-19 20:29 ` Thomas Gleixner
2019-08-19 14:32 ` [patch 43/44] posix-cpu-timers: Utilize timerqueue for storage Thomas Gleixner
2019-08-19 14:32 ` [patch 44/44] posix-cpu-timers: Expire timers directly Thomas Gleixner
2019-08-19 19:09 ` Ingo Molnar
2019-08-20 13:07 ` Thomas Gleixner
2019-08-20 2:18 ` [patch 00/44] posix-cpu-timers: Cleanup and consolidation Christoph Hellwig
2019-08-20 13:09 ` Thomas Gleixner
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