mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Aveline Noir <jm5905938@gmail.com>
To: SJ Park <sj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	damon@lists.linux.dev, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [BUG] DAMON_STAT: idle percentiles out of order on 32-bit
Date: Thu, 15 Oct 2026 22:45:01 +0800	[thread overview]
Message-ID: <179207550140.2.6042983090152523193@gmail.com> (raw)
In-Reply-To: <20261015141319.88393-1-sj@kernel.org>

Hi SJ,

I haven't seen this affect a real workload. I found it while testing
DAMON_STAT on 32-bit.

The upper percentiles can stay at zero or keep old values. If someone
uses them to judge how much memory is cold or to choose a reclaim
threshold, they could get the wrong picture.

I'll send the fix and test results in a separate mail.

Thanks,
Aveline Noir

      reply	other threads:[~2026-10-15 14:46 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-15 11:24 Aveline Noir
2026-10-15 14:13 ` SJ Park
2026-10-15 14:45   ` Aveline Noir [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=179207550140.2.6042983090152523193@gmail.com \
    --to=jm5905938@gmail.com \
    --cc=akpm@linux-foundation.org \
    --cc=damon@lists.linux.dev \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=sj@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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®