From: Akemi Yagi <toracat@elrepo.org>
To: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 0/2] pipe: Fixes [ver #2]
Date: Sat, 7 Dec 2019 13:31:13 -0800 [thread overview]
Message-ID: <qsh5n2$3pu9$1@blaine.gmane.org> (raw)
In-Reply-To: <CAHk-=wj9pprDUeoJd5EeN-2x7+GXdSsm44mSv1y9f5e7MrTZ2A@mail.gmail.com>
On 12/6/19 10:59 AM, Linus Torvalds wrote:
> Hmm. I think I just saw this same bug with a plain kernel compile.
>
> My "make -j32" suddenly came to a crawl, and seems to be entirely
> single-threaded.
>
> And that's almost certainly because the way 'make' handles load
> distribution is with a network of pipes that has a token passed to the
> sub-makes.
>
> So there's most definitely something wrong with the new pipe rework.
> Well, I can't _guarantee_ the pipes are the cause of this, but it does
> smell like it.
>
> Linus
>
We encountered what seems to be the same problem when building a kernel
under RHEL 8.
As it turned out, this was due to a bug in make (make-4.2.1-9.el8) and
a patch is available. Details are found in this Red Hat bugzilla report:
https://bugzilla.redhat.com/show_bug.cgi?id=1774790
Akemi
next prev parent reply other threads:[~2019-12-07 21:31 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-05 22:30 [PATCH 0/2] pipe: Fixes [ver #2] David Howells
2019-12-05 22:30 ` [PATCH 1/2] pipe: Remove assertion from pipe_poll() " David Howells
2019-12-05 22:30 ` [PATCH 2/2] pipe: Fix missing mask update after pipe_wait() " David Howells
2019-12-05 23:58 ` Linus Torvalds
2019-12-06 13:56 ` [PATCH 0/2] pipe: Fixes " David Sterba
2019-12-06 17:09 ` Linus Torvalds
2019-12-06 17:42 ` Linus Torvalds
2019-12-06 18:59 ` Linus Torvalds
2019-12-07 21:31 ` Akemi Yagi [this message]
2019-12-08 16:45 ` Akemi Yagi
2019-12-08 18:04 ` Linus Torvalds
2019-12-09 3:07 ` Linus Torvalds
2019-12-06 20:28 ` Linus Torvalds
2019-12-06 21:04 ` Linus Torvalds
2019-12-07 3:50 ` Linus Torvalds
2019-12-07 4:01 ` Linus Torvalds
2019-12-07 22:47 ` Linus Torvalds
2019-12-09 9:53 ` Vincent Guittot
2019-12-09 17:48 ` Linus Torvalds
2019-12-09 17:57 ` Akemi Yagi
2019-12-09 18:18 ` Linus Torvalds
2019-12-09 18:24 ` Linus Torvalds
2019-12-18 20:59 ` Josh Triplett
2019-12-10 2:58 ` DJ Delorie
2019-12-10 14:38 ` Vincent Guittot
2019-12-10 17:39 ` Linus Torvalds
2019-12-11 18:09 ` DJ Delorie
2019-12-11 18:59 ` Linus Torvalds
2019-12-12 10:18 ` Konstantin Khlebnikov
2019-12-18 22:51 ` Linus Torvalds
2019-12-19 0:03 ` Josh Triplett
2019-12-19 0:14 ` Josh Triplett
2019-12-19 0:51 ` Linus Torvalds
2019-12-19 0:54 ` Linus Torvalds
2019-12-19 7:56 ` David Howells
2019-12-19 16:35 ` Linus Torvalds
2019-12-11 20:55 ` David Howells
2019-12-12 1:28 ` Linus Torvalds
2019-12-12 7:34 ` David Howells
2019-12-09 14:55 ` David Sterba
2019-12-06 21:26 ` David Howells
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