From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: zhe.he@windriver.com, acme@kernel.org, ak@linux.intel.com,
alexander.shishkin@linux.intel.com, bp@alien8.de, hpa@zytor.com,
jolsa@kernel.org, jolsa@redhat.com, kan.liang@linux.intel.com,
mingo@redhat.com, namhyung@kernel.org, tglx@linutronix.de,
x86@kernel.org, linux-kernel@vger.kernel.org,
linux-rt-users@vger.kernel.org
Subject: Re: [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state
Date: Tue, 18 Dec 2018 12:16:37 +0100 [thread overview]
Message-ID: <20181218111637.b53u5pi3nxnyldaq@linutronix.de> (raw)
In-Reply-To: <20181218110209.GD15430@hirez.programming.kicks-ass.net>
On 2018-12-18 12:02:09 [+0100], Peter Zijlstra wrote:
> On Tue, Dec 18, 2018 at 06:30:33PM +0800, zhe.he@windriver.com wrote:
> > Besides, in preempt-rt full mode, the freeing can happen in atomic context and
> > thus cause the following BUG.
>
> Hurm, I though we fixed all those long ago..
>
> And no, the patch is horrible; that's what we have things like
> x86_pmu::cpu_dead() for.
ehm, you say we keep memory allocation +free on CPU up/down?
Sebastian
next prev parent reply other threads:[~2018-12-18 11:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 10:30 [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state zhe.he
2018-12-18 11:02 ` Peter Zijlstra
2018-12-18 11:16 ` Sebastian Andrzej Siewior [this message]
2018-12-18 11:31 ` Peter Zijlstra
2018-12-18 11:37 ` Peter Zijlstra
2018-12-18 11:47 ` Sebastian Andrzej Siewior
2018-12-18 12:34 ` Peter Zijlstra
2018-12-18 12:45 ` He Zhe
2018-12-18 13:59 ` Sebastian Andrzej Siewior
2018-12-19 16:53 ` [PATCH] perf/x86/intel: Delay memory deallocation until x86_pmu_dead_cpu() Sebastian Andrzej Siewior
2019-02-04 8:48 ` [tip:perf/core] " tip-bot for Peter Zijlstra
2018-12-18 11:25 ` [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state Thomas Gleixner
2018-12-18 11:38 ` Peter Zijlstra
2018-12-18 11:14 ` Sebastian Andrzej Siewior
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=20181218111637.b53u5pi3nxnyldaq@linutronix.de \
--to=bigeasy@linutronix.de \
--cc=acme@kernel.org \
--cc=ak@linux.intel.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=jolsa@kernel.org \
--cc=jolsa@redhat.com \
--cc=kan.liang@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
--cc=zhe.he@windriver.com \
/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).