From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Lieven <pl@kamp.de>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
qemu-devel@nongnu.org, Fam Zheng <famz@redhat.com>,
Peter Maydell <peter.maydell@linaro.org>
Subject: Re: [Qemu-devel] Qemu and heavily increased RSS usage
Date: Fri, 24 Jun 2016 00:10:14 -0400 (EDT) [thread overview]
Message-ID: <7575263.1646445.1466741414660.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <576C5481.6070605@kamp.de>
> > If it's 10M nothing. If there is a 100M regression that is also caused
> > by RCU, we have to give up on it for that data structure, or mmap/munmap
> > the affected data structures.
>
> If it was only 10MB I would agree. But if I run the VM described earlier
> in this thread it goes from ~35MB with Qemu-2.2.0 to ~130-150MB with
> current master. This is with coroutine pool disabled. With the coroutine pool
> it can grow to sth like 300-350MB.
>
> Is there an easy way to determinate if RCU is the problem? I have the same
> symptoms, valgrind doesn't see the allocated memory. Is it possible
> to make rcu_call directly invoking the function - maybe with a lock around it
> that serializes the calls? Even if its expensive it might show if we search
> at the right place.
Yes, you can do that. Just make it call the function without locks, for
a quick PoC it will be okay.
Paolo
next prev parent reply other threads:[~2016-06-24 4:10 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-21 8:21 [Qemu-devel] Qemu and heavily increased RSS usage Peter Lieven
2016-06-21 13:18 ` Dr. David Alan Gilbert
2016-06-21 15:12 ` Peter Lieven
2016-06-22 10:56 ` Stefan Hajnoczi
2016-06-22 19:55 ` Peter Lieven
2016-06-22 20:56 ` Peter Maydell
2016-06-24 9:37 ` Stefan Hajnoczi
2016-06-24 9:53 ` Peter Lieven
2016-06-24 9:57 ` Dr. David Alan Gilbert
2016-06-24 9:58 ` Peter Maydell
2016-06-24 10:45 ` Peter Lieven
2016-06-27 12:39 ` Stefan Hajnoczi
2016-06-27 13:33 ` Peter Lieven
2016-06-23 9:57 ` Peter Lieven
2016-06-24 22:57 ` Michael S. Tsirkin
2016-06-23 14:58 ` Peter Lieven
2016-06-23 15:00 ` Dr. David Alan Gilbert
2016-06-23 15:02 ` Peter Lieven
2016-06-23 15:21 ` Paolo Bonzini
2016-06-23 15:31 ` Peter Lieven
2016-06-23 15:47 ` Paolo Bonzini
2016-06-23 16:19 ` Peter Lieven
2016-06-23 16:53 ` Paolo Bonzini
2016-06-23 21:28 ` Peter Lieven
2016-06-24 4:10 ` Paolo Bonzini [this message]
2016-06-24 8:11 ` Peter Lieven
2016-06-24 8:20 ` Paolo Bonzini
2016-06-24 8:45 ` Peter Lieven
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=7575263.1646445.1466741414660.JavaMail.zimbra@redhat.com \
--to=pbonzini@redhat.com \
--cc=dgilbert@redhat.com \
--cc=famz@redhat.com \
--cc=peter.maydell@linaro.org \
--cc=pl@kamp.de \
--cc=qemu-devel@nongnu.org \
/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).