From: Wenjie Qi <qwjhust@gmail.com>
To: akpm@linux-foundation.org
Cc: willy@infradead.org, jack@suse.cz, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
baohua@kernel.org, qiwenjie@xiaomi.com
Subject: Re: [PATCH] mm: filemap: tighten dropbehind completion context check
Date: Sat, 29 Aug 2026 20:13:35 +0800 [thread overview]
Message-ID: <20260829121335.3491374-1-qwjhust@gmail.com> (raw)
In-Reply-To: <20260828181035.ce6e23970d37e38b64818f10@linux-foundation.org>
I kept the helper private to avoid an MM dependency on <linux/bio.h>.
After looking further at the mapped-folio case Matthew raised, I think the
better fix is to retain a dropbehind folio once it is mapped. A mapping
represents a competing cached user, and retaining it avoids the sleeping
unmap path, so filemap no longer needs a stricter context helper; the
existing in_task() guard remains. I will respin the patch on that basis.
next prev parent reply other threads:[~2026-08-29 12:13 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-20 14:29 Wenjie Qi
2026-08-20 14:34 ` Matthew Wilcox
2026-08-21 1:23 ` Wenjie Qi
2026-08-21 3:30 ` Matthew Wilcox
2026-08-24 13:34 ` Wenjie Qi
2026-08-29 1:10 ` Andrew Morton
2026-08-29 12:13 ` Wenjie Qi [this message]
2026-08-30 8:45 ` Barry Song
2026-08-29 12:30 ` [PATCH v2] mm: filemap: retain mapped dropbehind folios Wenjie Qi
2026-08-29 14:47 ` Matthew Wilcox
2026-08-29 15:53 ` Tal Zussman
2026-08-29 16:09 ` Tal Zussman
2026-08-29 17:36 ` [PATCH v3] " Wenjie Qi
2026-08-29 18:16 ` Andrew Morton
2026-08-30 3:25 ` [PATCH v4] " Wenjie Qi
2026-08-30 8:35 ` Barry Song
2026-08-30 9:13 ` Wenjie Qi
2026-08-30 9:31 ` Barry Song
2026-08-30 11:58 ` Tal Zussman
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