linux-kernel - Re: [PATCH v6 1/7] psi: introduce state_mask to represent stalled psi states

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Message-ID: <CAJuCfpFEqv+x2GnSeU_JLQ3ahvfgNVPYyoRAxkDHcvVw-4r=jg@mail.gmail.com>
Date:   Tue, 19 Mar 2019 17:06:50 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, lizefan@...wei.com,
        Johannes Weiner <hannes@...xchg.org>, axboe@...nel.dk,
        dennis@...nel.org, Dennis Zhou <dennisszhou@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
        linux-mm <linux-mm@...ck.org>, linux-doc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH v6 1/7] psi: introduce state_mask to represent stalled psi states

On Tue, Mar 19, 2019 at 5:02 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi Suren,

Hi Stephen,

> On Tue, 19 Mar 2019 16:56:13 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:
> >
> > The psi monitoring patches will need to determine the same states as
> > record_times().  To avoid calculating them twice, maintain a state mask
> > that can be consulted cheaply.  Do this in a separate patch to keep the
> > churn in the main feature patch at a minimum.
> >
> > This adds 4-byte state_mask member into psi_group_cpu struct which results
> > in its first cacheline-aligned part becoming 52 bytes long.  Add explicit
> > values to enumeration element counters that affect psi_group_cpu struct
> > size.
> >
> > Link: http://lkml.kernel.org/r/20190124211518.244221-4-surenb@google.com
> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> > Acked-by: Johannes Weiner <hannes@...xchg.org>
> > Cc: Dennis Zhou <dennis@...nel.org>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Jens Axboe <axboe@...nel.dk>
> > Cc: Li Zefan <lizefan@...wei.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Tejun Heo <tj@...nel.org>
> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
>
> This last SOB line should not be here ... it is only there on the
> original patch because I import Andrew's quilt series into linux-next.

Sorry about that. This particular patch has not changed since then,
that's why I kept all the lines there. Please let me know if I should
remove it and re-post the patchset.
Thanks,
Suren.

> --
> Cheers,
> Stephen Rothwell
>
> --
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