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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAJz2qXm4FKoqMMeM7n=dVpXm6Tko9edun49b=VVsN3j=xQCagQ@mail.gmail.com>
Date:   Wed, 27 May 2020 11:17:08 +0300
From:   John Mathew <john.mathew@...kie.com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.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 <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        rostedt@...dmis.org, Benjamin Segall <bsegall@...gle.com>,
        mgorman@...e.de, bristot@...hat.com, tsbogend@...ha.franken.de,
        Lukas Bulwahn <lukas.bulwahn@...il.com>, x86@...nel.org,
        linux-mips@...r.kernel.org, tglx@...utronix.de,
        mostafa.chamanara@...il.com, willy@...radead.org,
        Valentin Schneider <valentin.schneider@....com>,
        Randy Dunlap <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

On Tue, May 26, 2020 at 1:26 PM Srikar Dronamraju
<srikar@...ux.vnet.ibm.com> wrote:
>
> * 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
Fixed in v6.
>
> > +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?
I reworded the description in v6.
>
> > +  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.
Yes, hopefully better described in the v6.
Please review and ack.
> > +
> --
> Thanks and Regards
> Srikar Dronamraju