From: Linus Torvalds <torvalds@linux-foundation.org>
To: Matthieu Baerts <matthieu.baerts@tessares.net>
Cc: Michael Larabel <Michael@michaellarabel.com>,
Matthew Wilcox <willy@infradead.org>,
Amir Goldstein <amir73il@gmail.com>,
"Ted Ts'o" <tytso@google.com>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Ext4 Developers List <linux-ext4@vger.kernel.org>,
Jan Kara <jack@suse.cz>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: Kernel Benchmarking
Date: Tue, 15 Sep 2020 12:32:44 -0700 [thread overview]
Message-ID: <CAHk-=wiHPE3Q-qARO+vqbN0FSHwQXCYSmKcrjgxqVLJun5DjhA@mail.gmail.com> (raw)
In-Reply-To: <a9faedf1-c528-38e9-2ac4-e8847ecda0f2@tessares.net>
On Tue, Sep 15, 2020 at 12:26 PM Matthieu Baerts
<matthieu.baerts@tessares.net> wrote:
>
> I don't know if this info is useful but I just checked and I can
> reproduce the issue with a single CPU.
Good thinking.
> And the trace is very similar to the previous one:
.. and yes, now there are no messy traces, they all have that
__lock_page_killable() unambiguously in them (and the only '?' entries
are just from stale stuff on the stack which is due to stack frames
that aren't fully initialized and old stack frame data shining
through).
So it does seem like the previous trace uncertainty was likely just a
cross-CPU issue.
Was that an actual UP kernel? It might be good to try that too, just
to see if it could be an SMP race in the page locking code.
After all, one such theoretical race was one reason I started the rewrite.
Linus
next prev parent reply other threads:[~2020-09-15 19:33 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAHk-=wiZnE409WkTOG6fbF_eV1LgrHBvMtyKkpTqM9zT5hpf9A@mail.gmail.com>
[not found] ` <aa90f272-1186-f9e1-8fdb-eefd332fdae8@MichaelLarabel.com>
[not found] ` <CAHk-=wh_31_XBNHbdF7EUJceLpEpwRxVF+_1TONzyBUym6Pw4w@mail.gmail.com>
[not found] ` <e24ef34d-7b1d-dd99-082d-28ca285a79ff@MichaelLarabel.com>
[not found] ` <CAHk-=wgEE4GuNjcRaaAvaS97tW+239-+tjcPjTq2FGhEuM8HYg@mail.gmail.com>
[not found] ` <6e1d8740-2594-c58b-ff02-a04df453d53c@MichaelLarabel.com>
[not found] ` <CAHk-=wgJ3-cEkU-5zXFPvRCHKkCCuKxVauYWGphjePEhJJgtgQ@mail.gmail.com>
[not found] ` <d2023f4c-ef14-b877-b5bb-e4f8af332abc@MichaelLarabel.com>
[not found] ` <CAHk-=wiz=J=8mJ=zRG93nuJ9GtQAm5bSRAbWJbWZuN4Br38+EQ@mail.gmail.com>
[not found] ` <CAHk-=wimM2kckaYj7spUJwehZkSYxK9RQqu3G392BE=73dyKtg@mail.gmail.com>
[not found] ` <8bb582d2-2841-94eb-8862-91d1225d5ebc@MichaelLarabel.com>
[not found] ` <CAHk-=wjqE_a6bpZyDQ4DCrvj_Dv2RwQoY7wN91kj8y-tZFRvEA@mail.gmail.com>
[not found] ` <0cbc959e-1b8d-8d7e-1dc6-672cf5b3899a@MichaelLarabel.com>
[not found] ` <CAHk-=whP-7Uw9WgWgjRgF1mCg+NnkOPpWjVw+a9M3F9C52DrVg@mail.gmail.com>
[not found] ` <CAHk-=wjfw3U5eTGWLaisPHg1+jXsCX=xLZgqPx4KJeHhEqRnEQ@mail.gmail.com>
[not found] ` <a2369108-7103-278c-9f10-6309a0a9dc3b@MichaelLarabel.com>
2020-09-12 7:28 ` Kernel Benchmarking Amir Goldstein
2020-09-12 10:32 ` Michael Larabel
2020-09-12 14:37 ` Matthew Wilcox
2020-09-12 14:44 ` Michael Larabel
2020-09-15 3:32 ` Matthew Wilcox
2020-09-15 10:39 ` Jan Kara
2020-09-15 13:52 ` Matthew Wilcox
[not found] ` <658ae026-32d9-0a25-5a59-9c510d6898d5@MichaelLarabel.com>
2020-09-14 17:47 ` Linus Torvalds
2020-09-14 20:21 ` Matthieu Baerts
2020-09-14 20:53 ` Linus Torvalds
2020-09-15 0:42 ` Linus Torvalds
2020-09-15 15:34 ` Matthieu Baerts
2020-09-15 18:27 ` Linus Torvalds
2020-09-15 18:47 ` Linus Torvalds
2020-09-15 19:26 ` Matthieu Baerts
2020-09-15 19:32 ` Linus Torvalds [this message]
2020-09-15 19:56 ` Matthieu Baerts
2020-09-15 23:35 ` Linus Torvalds
2020-09-16 10:34 ` Jan Kara
2020-09-16 18:47 ` Linus Torvalds
[not found] ` <9a92bf16-02c5-ba38-33c7-f350588ac874@tessares.net>
2020-09-15 19:24 ` Linus Torvalds
2020-09-15 19:38 ` Matthieu Baerts
2020-09-15 18:31 ` Linus Torvalds
2020-09-15 14:21 ` Michael Larabel
2020-09-15 17:52 ` Linus Torvalds
2020-09-17 17:51 ` Linus Torvalds
2020-09-17 18:23 ` Matthew Wilcox
2020-09-17 18:30 ` Linus Torvalds
2020-09-17 18:50 ` Matthew Wilcox
2020-09-17 19:00 ` Linus Torvalds
2020-09-17 19:27 ` Matthew Wilcox
2020-09-17 19:47 ` Linus Torvalds
2020-09-18 0:39 ` Sedat Dilek
2020-09-18 0:40 ` Sedat Dilek
2020-09-18 20:25 ` Sedat Dilek
2020-09-20 17:06 ` Linus Torvalds
2020-09-20 17:14 ` Sedat Dilek
2020-09-20 17:40 ` Linus Torvalds
2020-09-20 18:00 ` Sedat Dilek
2020-09-20 23:23 ` Dave Chinner
2020-09-20 23:31 ` Linus Torvalds
2020-09-20 23:40 ` Linus Torvalds
2020-09-21 1:20 ` Dave Chinner
2020-09-12 15:53 ` Matthew Wilcox
2020-09-12 17:59 ` Linus Torvalds
2020-09-12 20:32 ` Rogério Brito
2020-09-14 9:33 ` Jan Kara
2020-09-12 20:58 ` Josh Triplett
2020-09-12 20:59 ` James Bottomley
2020-09-12 21:15 ` Linus Torvalds
2020-09-12 22:32 ` Matthew Wilcox
2020-09-13 0:40 ` Dave Chinner
2020-09-13 2:39 ` Linus Torvalds
2020-09-13 3:40 ` Matthew Wilcox
2020-09-13 23:45 ` Dave Chinner
2020-09-14 3:31 ` Matthew Wilcox
2020-09-15 14:28 ` Chris Mason
2020-09-15 9:27 ` Jan Kara
2020-09-13 3:18 ` Matthew Wilcox
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