From: Daniel Colascione <dancol@google.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Joel Fernandes <joel@joelfernandes.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Tim Murray <timmurray@google.com>,
Carmen Jackson <carmenjackson@google.com>,
Mayank Gupta <mayankgupta@google.com>,
Steven Rostedt <rostedt@goodmis.org>,
Minchan Kim <minchan@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Android Kernel Team <kernel-team@android.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Dan Williams <dan.j.williams@intel.com>,
Jerome Glisse <jglisse@redhat.com>,
linux-mm <linux-mm@kvack.org>,
Matthew Wilcox <willy@infradead.org>,
Ralph Campbell <rcampbell@nvidia.com>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH v2] mm: emit tracepoint when RSS changes by threshold
Date: Wed, 4 Sep 2019 10:17:33 -0700 [thread overview]
Message-ID: <CAKOZueuGML_ZX8Pk5csLK7TWEVwqGj=KZTh2TELNsLytkrHCTQ@mail.gmail.com> (raw)
In-Reply-To: <20190904153759.GC3838@dhcp22.suse.cz>
On Wed, Sep 4, 2019 at 8:38 AM Michal Hocko <mhocko@kernel.org> wrote:
> > but also for reducing
> > tracing noise. Flooding the traces makes it less useful for long traces and
> > post-processing of traces. IOW, the overhead reduction is a bonus.
>
> This is not really anything special for this tracepoint though.
> Basically any tracepoint in a hot path is in the same situation and I do
> not see a point why each of them should really invent its own way to
> throttle. Maybe there is some way to do that in the tracing subsystem
> directly.
I agree. I'd rather not special-case RSS in this way, especially not
with a hardcoded aggregation and thresholding configuration. It should
be possible to handle high-frequency trace data point aggregation in a
general way. Why shouldn't we be able to get a time series for, say,
dirty pages? Or various slab counts? IMHO, any counter on the system
ought to be observable in a uniform way.
prev parent reply other threads:[~2019-09-04 17:18 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-03 20:09 Joel Fernandes (Google)
2019-09-04 4:44 ` Suren Baghdasaryan
2019-09-04 4:51 ` Daniel Colascione
2019-09-04 5:15 ` Joel Fernandes
2019-09-04 5:42 ` Daniel Colascione
2019-09-04 14:59 ` Joel Fernandes
2019-09-04 17:15 ` Daniel Colascione
2019-09-04 23:59 ` sspatil
2019-09-04 5:02 ` Joel Fernandes
2019-09-04 5:38 ` Suren Baghdasaryan
2019-09-04 8:45 ` Michal Hocko
2019-09-04 15:32 ` Joel Fernandes
2019-09-04 15:37 ` Michal Hocko
2019-09-04 16:28 ` Joel Fernandes
2019-09-05 10:54 ` Michal Hocko
2019-09-05 14:14 ` Joel Fernandes
2019-09-05 14:20 ` Michal Hocko
2019-09-05 14:23 ` Joel Fernandes
2019-09-05 14:43 ` Michal Hocko
2019-09-05 16:03 ` Suren Baghdasaryan
2019-09-05 17:35 ` Steven Rostedt
2019-09-05 17:39 ` Suren Baghdasaryan
2019-09-05 17:43 ` Tim Murray
2019-09-05 17:47 ` Joel Fernandes
2019-09-05 17:51 ` Joel Fernandes
2019-09-05 19:56 ` Tom Zanussi
2019-09-05 20:24 ` Daniel Colascione
2019-09-05 20:32 ` Tom Zanussi
2019-09-05 21:14 ` Tom Zanussi
2019-09-05 22:12 ` Daniel Colascione
2019-09-05 22:51 ` Daniel Colascione
2019-09-05 17:50 ` Daniel Colascione
2019-09-06 0:59 ` Joel Fernandes
2019-09-06 1:15 ` Daniel Colascione
2019-09-06 3:01 ` Joel Fernandes
2019-09-04 17:17 ` Daniel Colascione [this message]
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