linux-kernel - Re: [PATCH v2] mm: emit tracepoint when RSS changes by threshold

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Message-ID: <CAKOZuesWV9yxbS9+T5+p1Ty1-=vFeYcHuO=6MgzTY8akMhbFbQ@mail.gmail.com>
Date:   Tue, 3 Sep 2019 21:51:20 -0700
From:   Daniel Colascione <dancol@...gle.com>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Tim Murray <timmurray@...gle.com>,
        Carmen Jackson <carmenjackson@...gle.com>,
        Mayank Gupta <mayankgupta@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kernel-team <kernel-team@...roid.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jerome Glisse <jglisse@...hat.com>,
        linux-mm <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.cz>,
        Ralph Campbell <rcampbell@...dia.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH v2] mm: emit tracepoint when RSS changes by threshold

On Tue, Sep 3, 2019 at 9:45 PM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> On Tue, Sep 3, 2019 at 1:09 PM Joel Fernandes (Google)
> <joel@...lfernandes.org> wrote:
> >
> > Useful to track how RSS is changing per TGID to detect spikes in RSS and
> > memory hogs. Several Android teams have been using this patch in various
> > kernel trees for half a year now. Many reported to me it is really
> > useful so I'm posting it upstream.

It's also worth being able to turn off the per-task memory counter
caching, otherwise you'll have two levels of batching before the
counter gets updated, IIUC.