From: SeongJae Park <sj@kernel.org>
To: SeongJae Park <sj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
damon@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, acsjakub@amazon.de
Subject: Re: [PATCH 0/5] avoid divide-by-zero due to max_nr_accesses overflow
Date: Fri, 20 Oct 2023 17:31:20 +0000 [thread overview]
Message-ID: <20231020173120.64224-1-sj@kernel.org> (raw)
In-Reply-To: <20231020171901.63994-1-sj@kernel.org>
On Fri, 20 Oct 2023 17:19:01 +0000 SeongJae Park <sj@kernel.org> wrote:
> On Thu, 19 Oct 2023 19:49:19 +0000 SeongJae Park <sj@kernel.org> wrote:
>
> > The maximum nr_accesses of given DAMON context can be calculated by
> > dividing the aggregation interval by the sampling interval. Some logics
> > in DAMON uses the maximum nr_accesses as a divisor. Hence, the value
> > shouldn't be zero. Such case is avoided since DAMON avoids setting the
> > agregation interval as samller than the sampling interval. However,
> > since nr_accesses is unsigned int while the intervals are unsigned long,
> > the maximum nr_accesses could be zero while casting.
>
> Actually, the issue was reported by Jakub, and I didn't add 'Reported-by:' tags
> for him. I sure Andrew could add that on his own, but I want to minimize
> Andrew's load, so will send v2 of this patchset. Andrew, please let me know if
> that doesn't help but only increasing your load.
So sent the second version[1] with the
"Reported-by: akub Acs <acsjakub@amazon.de>" line, but then I noticed the patch
is already added to mm queue[2]. Somehow the notification mails delivered bit
later than usual.
Sorry for making this noise, Andrew. Please add
"Reported-by: akub Acs <acsjakub@amazon.de>" to already added patches, or
replace those with the v2 if possible. Also, please let me know if there's
anything I could help.
[1] https://lore.kernel.org/damon/20231020172317.64192-1-sj@kernel.org/
[2] https://lore.kernel.org/mm-commits/20231020171847.C6EEAC433C7@smtp.kernel.org/
Thanks,
SJ
>
>
> Thanks,
> SJ
>
prev parent reply other threads:[~2023-10-20 17:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-19 19:49 [PATCH 0/5] avoid divide-by-zero due to max_nr_accesses overflow SeongJae Park
2023-10-19 19:49 ` [PATCH 1/5] mm/damon: implement a function for max nr_accesses safe calculation SeongJae Park
2023-10-19 19:49 ` [PATCH 2/5] mm/damon/core: avoid divide-by-zero during monitoring results update SeongJae Park
2023-10-19 19:49 ` [PATCH 3/5] mm/damon/ops-common: avoid divide-by-zero during region hotness calculation SeongJae Park
2023-10-19 19:49 ` [PATCH 4/5] mm/damon/lru_sort: avoid divide-by-zero in hot threshold calculation SeongJae Park
2023-10-19 19:49 ` [PATCH 5/5] mm/damon/core: avoid divide-by-zero from pseudo-moving window length calculation SeongJae Park
2023-10-20 17:19 ` [PATCH 0/5] avoid divide-by-zero due to max_nr_accesses overflow SeongJae Park
2023-10-20 17:30 ` Andrew Morton
2023-10-20 18:02 ` SeongJae Park
2023-10-20 17:31 ` SeongJae Park [this message]
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