从上面可以看出, sched_waking和sched_wakeup在wakeup task过程中肯定都会发生, sched_waking事件在ttwu开始的时候触发, 而sched_wakeup在ttwu结束的时候触发. 一般情况下, 这2个tracepoint触发的时间非常靠近, 但是不排除中间会有较大gap. sched_migrate_task 从资源的角度看, 只有系统中存在多个同类资源(这里是cpu...
#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ #define SD_ASYM_CPUCAPACITY 0x0040 /* Groups have different max cpu capacities */ #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu capacity */ #define...
Development version of the Upstream MultiPath TCP Linux kernel 🐧 - Merge tag 'sched_ext-for-6.12-rc7-fixes' of git://git.kernel.org/pub/… · multipath-tcp/mptcp_net-next@3022e9d
Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries...)
Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries...)
* once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).* * However, with slightly different timing the wakeup TASK_RUNNING store can ...
[ 94.691906] (detected by 3, t=60002 jiffies, g=20409, q=2556) [ 94.691911] rcu: All QSes seen, last rcu_sched kthread activity 59998 (4294762429-4294702431), jiffies_till_next_fqs=3, root ->qsmask 0x0 [ 94.691918] rcu: rcu_sched kthread timer wakeup didn't happen for 59995 ...
patch很小,优化效果不明确,但是很有意思; [PATCH 0/2] sched/fair: Enhance sync wakeup for short duration tasksfalse sharing是个一直避不开的问题,在patch中,介绍了false sharing可以通过perf c2c方式,…
You can use the wakeup probe to explore this hypothesis by determining who is waking the xterm processes, and when, as shown in the following example:#pragma D option quiet dtrace:::BEGIN { start = timestamp; } sched:::wakeup /stringof(args[1]->pr_fname) == "xterm"/ { @[exec...
if (smp_load_acquire(&p->on_cpu) && //true* deactivate_task ttwu_queue_wakelist)* p->on_rq = 0; p->sched_remote_wakeup = Y;** guarantees all stores of 'current' are visible before* ->sched_remote_wakeup gets used, so it can be in this word.*/unsignedsched_remote_wakeup:1;...