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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.