All of lore.kernel.org
 help / color / mirror / Atom feed
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Wei Wang <wei.w.wang@intel.com>, Michal Hocko <mhocko@kernel.org>
Cc: virtio-dev@lists.oasis-open.org, mst@redhat.com,
	linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
	akpm@linux-foundation.org
Subject: Re: [PATCH v2 2/2] virtio_balloon: replace oom notifier with shrinker
Date: Thu, 2 Aug 2018 20:00:32 +0900	[thread overview]
Message-ID: <87d7ae45-79cb-e294-7397-0e45e2af49cd__11941.8864058845$1533209922$gmane$org@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <5B62DDCC.3030100@intel.com>

On 2018/08/02 19:32, Wei Wang wrote:
> On 08/01/2018 07:34 PM, Michal Hocko wrote:
>> Do you have any numbers for how does this work in practice?
> 
> It works in this way: for example, we can set the parameter, balloon_pages_to_shrink,
> to shrink 1GB memory once shrink scan is called. Now, we have a 8GB guest, and we balloon
> out 7GB. When shrink scan is called, the balloon driver will get back 1GB memory and give
> them back to mm, then the ballooned memory becomes 6GB.

Since shrinker might be called concurrently (am I correct?), the balloon might deflate
far more than needed if it releases such much memory. If shrinker is used, releasing 256
pages might be sufficient.

  reply	other threads:[~2018-08-02 11:00 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-27  9:24 [PATCH v2 0/2] virtio-balloon: some improvements Wei Wang
2018-07-27  9:24 ` [virtio-dev] " Wei Wang
2018-07-27  9:24 ` Wei Wang
2018-07-27  9:24 ` [PATCH v2 1/2] virtio-balloon: remove BUG() in init_vqs Wei Wang
2018-07-27  9:24 ` Wei Wang
2018-07-27  9:24   ` [virtio-dev] " Wei Wang
2018-07-27  9:24 ` [PATCH v2 2/2] virtio_balloon: replace oom notifier with shrinker Wei Wang
2018-07-27  9:24   ` [virtio-dev] " Wei Wang
2018-07-30  9:00   ` Michal Hocko
2018-07-30  9:00     ` Michal Hocko
2018-08-01 11:12     ` Wei Wang
2018-08-01 11:12       ` [virtio-dev] " Wei Wang
2018-08-01 11:34       ` Michal Hocko
2018-08-01 11:34       ` Michal Hocko
2018-08-02 10:32         ` Wei Wang
2018-08-02 10:32           ` [virtio-dev] " Wei Wang
2018-08-02 11:00           ` Tetsuo Handa [this message]
2018-08-02 11:00           ` Tetsuo Handa
2018-08-02 11:27             ` Wei Wang
2018-08-02 11:27             ` Wei Wang
2018-08-02 11:27               ` [virtio-dev] " Wei Wang
2018-08-02 11:29               ` Michal Hocko
2018-08-02 11:29               ` Michal Hocko
2018-08-02 11:47           ` Michal Hocko
2018-08-03  5:35             ` Wei Wang
2018-08-03  5:35               ` [virtio-dev] " Wei Wang
2018-08-03  5:35               ` Wei Wang
2018-08-02 11:47           ` Michal Hocko
2018-08-02 15:18           ` Michael S. Tsirkin
2018-08-02 15:18             ` [virtio-dev] " Michael S. Tsirkin
2018-08-02 15:18           ` Michael S. Tsirkin
2018-08-02 10:32         ` Wei Wang
2018-08-01 11:12     ` Wei Wang
2018-07-27  9:24 ` Wei Wang
2018-07-27 14:06 ` [PATCH v2 0/2] virtio-balloon: some improvements Michael S. Tsirkin
2018-07-27 14:06 ` Michael S. Tsirkin
2018-07-27 14:06   ` [virtio-dev] " Michael S. Tsirkin
2018-07-28  2:00   ` Wang, Wei W
2018-07-28  2:00   ` Wang, Wei W
2018-07-28  2:00     ` [virtio-dev] " Wang, Wei W
2018-07-28  2:00     ` Wang, Wei W

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='87d7ae45-79cb-e294-7397-0e45e2af49cd__11941.8864058845$1533209922$gmane$org@I-love.SAKURA.ne.jp' \
    --to=penguin-kernel@i-love.sakura.ne.jp \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mhocko@kernel.org \
    --cc=mst@redhat.com \
    --cc=virtio-dev@lists.oasis-open.org \
    --cc=virtualization@lists.linux-foundation.org \
    --cc=wei.w.wang@intel.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 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.