From: bugzilla-daemon@kernel.org
To: linux-f2fs-devel@lists.sourceforge.net
Subject: [f2fs-dev] [Bug 216050] f2fs_gc occupies 100% cpu
Date: Wed, 21 Dec 2022 00:47:21 +0000 [thread overview]
Message-ID: <bug-216050-202145-ysd2d5QYuA@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-216050-202145@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=216050
--- Comment #118 from Yuriy Garin (yuriy.garin@gmail.com) ---
Created attachment 303439
--> https://bugzilla.kernel.org/attachment.cgi?id=303439&action=edit
debug patch - print page/folio/ref_count
This debug patch prints page, folio and folio reference count.
As far as I understand logic behind 'f2fs_put_page(page, 1); goto repeat;' -
it's an attempt to "unlock" page, release it from page cache and reload again.
(I've found it not easy to distinguish between page and folio pointer - it's a
C union, sometimes used as page, sometimes used as folio - definitely requires
more kernel expertise. Please, tell me what should be done better.)
After two weeks of running this patch, I've caught this GC problem and have a
log. Attaching it in the next message.
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2022-05-30 11:28 [f2fs-dev] [Bug 216050] New: fsfs_gc occupies 100% cpu bugzilla-daemon
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