linux-kernel - Re: [RFC PATCH v5 3/3] docs: scheduler: Add introduction to scheduler context-switch

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Message-ID: <20200526102511.GA5681@linux.vnet.ibm.com>
Date:   Tue, 26 May 2020 15:55:11 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     john mathew <john.mathew@...kie.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        corbet@....net, mingo@...hat.com, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, tsbogend@...ha.franken.de,
        lukas.bulwahn@...il.com, x86@...nel.org,
        linux-mips@...r.kernel.org, tglx@...utronix.de,
        mostafa.chamanara@...il.com, willy@...radead.org,
        valentin.schneider@....com, rdunlap@...radead.org,
        Mostafa Chamanara <mostafa.chamanara@...emark.com>,
        Oleg Tsymbal <oleg.tsymbal@...kie.com>
Subject: Re: [RFC PATCH v5 3/3] docs: scheduler: Add introduction to
 scheduler context-switch

* john mathew <john.mathew@...kie.com> [2020-05-14 12:26:37]:

> +
> +Context Switching
> +-----------------
> +
> +Context switching, the switching from a running task to another,
> +is done by the context_switch() function defined in kernel/sched.c.

context_switch is defined in kernel/sched/core.c 

> +It is called by __schedule() when a new process has been selected to run.
> +The execution flow is as follows:
> +
> +
> +  For a kernel task switching to a user task, switch_mm_irqs_off()
> +  replaces the address space of prev kernel task with the next from the user
> +  task. Same as for exiting process in this case, the context_switch()

Did you mean existing instead of exiting?

> +  function saves the pointer to the memory descriptor used by prev in the
> +  runqueue???s prev_mm field and resets prev task active address space.
> +
-- 
Thanks and Regards
Srikar Dronamraju