From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <ak@linux.intel.com>
Cc: zhangmengting <zhangmengting@huawei.com>,
linux-perf-users@vger.kernel.org, acme@redhat.com,
namhyung@kernel.org, jolsa@redhat.com, huawei.libin@huawei.com,
cj.chengjian@huawei.com, alexey.budankov@intel.com
Subject: Re: Question to perf spending a large amount of time monitoring a java process
Date: Tue, 5 Dec 2017 18:52:58 +0100 [thread overview]
Message-ID: <20171205175258.GN3165@worktop.lehotels.local> (raw)
In-Reply-To: <87bmjdjcpa.fsf@linux.intel.com>
On Tue, Dec 05, 2017 at 09:40:01AM -0800, Andi Kleen wrote:
> zhangmengting <zhangmengting@huawei.com> writes:
>
> > Hi all,
> >
> > I found that perf spends a large amount of time attaching and monitoring
> > a java process with lock, although the execution time of the java process
> > is below 1 minute.
>
> You could check if this patchkit helps
>
> https://lkml.org/lkml/2017/9/8/118
>
> Not sure why it's not moved forward. Peter?
Because its absolutely broken and I don't have had the time to work on
it much. There's a pile of patches here:
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core
that fix the worst of the fallout.
prev parent reply other threads:[~2017-12-05 17:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 7:32 Question to perf spending a large amount of time monitoring a java process zhangmengting
2017-12-01 8:03 ` Wangnan (F)
2017-12-05 17:40 ` Andi Kleen
2017-12-05 17:52 ` Peter Zijlstra [this message]
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