From: Dawei Li <daweilics@gmail.com>
To: linux-newbie@vger.kernel.org, kernel-janitors@vger.kernel.org,
linux-smp@vger.kernel.org
Subject: when/how is the schedule() function actually called?
Date: Thu, 7 Dec 2023 13:59:55 +0800 [thread overview]
Message-ID: <CAG5MgCpdTt5ZpSVg==YN92zr+0_ug+3sUOAwdjXJEu0a1BkWFg@mail.gmail.com> (raw)
Greetings!
I am reading several resources regarding the linux kernel scheduling
in kernel 2.6.34.
There seems to be the periodic scheduler (tick_periodic()), which
invokes the scheduler_tick() function, then the entity_tick()
function, and then the resched_task() function. However, eventually,
the resched_task() function doesn't invoke the schedule() function; it
only invokes the set_tsk_need_resched() function. So, it is only
setting the need_resched flag.
My question is, when/how is the schedule() function actually called?
Also, I notice that at many locations in the code, when there is the
need to do a scheduling, the code is just setting the need_resched
flag. Same question: when/how is the schedule() function actually
called?
Not sure if this list is still active. Appreciate any response.
Thanks!
reply other threads:[~2023-12-07 6:00 UTC|newest]
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