From: Peter Zijlstra <peterz@infradead.org>
To: Song Liu <songliubraving@fb.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
"acme@kernel.org" <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>,
Stephane Eranian <eranian@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"megha.dey@intel.com" <megha.dey@intel.com>,
"frederic@kernel.org" <frederic@kernel.org>
Subject: Re: [RFC][PATCH] perf: Rewrite core context handling
Date: Wed, 17 Oct 2018 19:19:55 +0200 [thread overview]
Message-ID: <20181017171955.GQ3121@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <82000D4A-0A1B-4A8B-904C-24640215D2BD@fb.com>
On Wed, Oct 17, 2018 at 04:43:27PM +0000, Song Liu wrote:
> > That makes task and cpu contexts wildly different, which will complicate
> > matters I feel.
> >
>
> I think we only need different logic when adding events to the task/cpu
> contexts. The ctx_sched_in() and ctx_sched_out() will need some extra
> logic to filter out events that are not being scheduled (don't schedule
> events on PMU-a when rotating PMU-b). This logic will be the same for
> task and cpu context. The difference is, the CPU context will not have
> such events, because we never added such event to CPU context.
>
> Does this make sense? I could try draft a RFC to see how difficult it is.
I'm not sure it saves much, if we have multiple per-cpu contexts we get
to re-introduce the active_ctx_list and loose the simplification for the
online status.
Plus that fundamental assymetry -- which would bother my OCD forever
more :-)
next prev parent reply other threads:[~2018-10-17 17:20 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 10:45 [RFC][PATCH] perf: Rewrite core context handling Peter Zijlstra
2018-10-11 7:50 ` Song Liu
2018-10-11 9:29 ` Peter Zijlstra
2018-10-11 22:37 ` Song Liu
2018-10-12 9:50 ` Peter Zijlstra
2018-10-12 14:25 ` Peter Zijlstra
2018-10-13 8:31 ` Song Liu
2018-10-16 9:50 ` Peter Zijlstra
2018-10-16 16:34 ` Song Liu
2018-10-16 18:10 ` Peter Zijlstra
2018-10-16 18:24 ` Song Liu
2018-10-12 7:04 ` Alexey Budankov
2018-10-12 11:54 ` Peter Zijlstra
2018-10-15 7:26 ` Alexey Budankov
2018-10-15 8:34 ` Peter Zijlstra
2018-10-15 8:53 ` Peter Zijlstra
2018-10-15 17:29 ` Alexey Budankov
2018-10-15 18:31 ` Stephane Eranian
2018-10-16 6:39 ` Alexey Budankov
2018-10-16 9:32 ` Peter Zijlstra
2018-10-15 22:09 ` Song Liu
2018-10-16 18:28 ` Song Liu
2018-10-17 11:06 ` Peter Zijlstra
2018-10-17 16:43 ` Song Liu
2018-10-17 17:19 ` Peter Zijlstra [this message]
2018-10-17 18:33 ` Peter Zijlstra
2018-10-17 18:57 ` Song Liu
2018-10-16 16:26 ` Mark Rutland
2018-10-16 18:07 ` Peter Zijlstra
2018-10-17 8:57 ` Alexey Budankov
2018-10-17 15:01 ` Alexander Shishkin
2018-10-17 15:58 ` Alexey Budankov
2018-10-17 16:30 ` Peter Zijlstra
2018-10-18 7:05 ` Alexey Budankov
2018-10-22 13:26 ` Alexander Shishkin
2018-10-23 6:13 ` Song Liu
2018-10-23 6:55 ` Peter Zijlstra
2019-05-15 11:17 ` Alexander Shishkin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181017171955.GQ3121@hirez.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=acme@kernel.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=alexey.budankov@linux.intel.com \
--cc=eranian@google.com \
--cc=frederic@kernel.org \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=megha.dey@intel.com \
--cc=mingo@kernel.org \
--cc=songliubraving@fb.com \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).