From: Michal Hocko <mhocko@kernel.org>
To: Joel Fernandes <joel@joelfernandes.org>,
Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Tim Murray <timmurray@google.com>,
carmenjackson@google.com, mayankgupta@google.com,
dancol@google.com, rostedt@goodmis.org, minchan@kernel.org,
akpm@linux-foundation.org, 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@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: Thu, 5 Sep 2019 16:43:10 +0200 [thread overview]
Message-ID: <20190905144310.GA14491@dhcp22.suse.cz> (raw)
In-Reply-To: <20190904162808.GO240514@google.com>
[Add Steven]
On Wed 04-09-19 12:28:08, Joel Fernandes wrote:
> On Wed, Sep 4, 2019 at 11:38 AM Michal Hocko <mhocko@kernel.org> wrote:
> >
> > On Wed 04-09-19 11:32:58, Joel Fernandes 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 am not sure if there is a way to do this easily. Add to that, the fact that
> you still have to call into trace events. Why call into it at all, if you can
> filter in advance and have a sane filtering default?
>
> The bigger improvement with the threshold is the number of trace records are
> almost halved by using a threshold. The number of records went from 4.6K to
> 2.6K.
Steven, would it be feasible to add a generic tracepoint throttling?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2019-09-05 14:43 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 [this message]
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
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