From: Tejun Heo <tj@kernel.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH] percpu: add a schedule point in pcpu_balance_workfn()
Date: Fri, 23 Feb 2018 08:53:17 -0800 [thread overview]
Message-ID: <20180223165317.GD1641506@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <1519402362.55655.70.camel@gmail.com>
On Fri, Feb 23, 2018 at 08:12:42AM -0800, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@google.com>
>
> When a large BPF percpu map is destroyed, I have seen
> pcpu_balance_workfn() holding cpu for hundreds of milliseconds.
>
> On KASAN config and 112 hyperthreads, average time to destroy a chunk
> is ~4 ms.
>
> [ 2489.841376] destroy chunk 1 in 4148689 ns
> ...
> [ 2490.093428] destroy chunk 32 in 4072718 ns
>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
Applied to percpu/for-4.16-fixes.
Thank, Eric.
--
tejun
prev parent reply other threads:[~2018-02-23 16:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-23 16:12 [PATCH] percpu: add a schedule point in pcpu_balance_workfn() Eric Dumazet
2018-02-23 16:53 ` Tejun Heo [this message]
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=20180223165317.GD1641506@devbig577.frc2.facebook.com \
--to=tj@kernel.org \
--cc=eric.dumazet@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.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.