From: Christoph Hellwig <hch@infradead.org>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: akpm@linux-foundation.org, viro@zeniv.linux.org.uk,
brauner@kernel.org, jack@suse.cz, david@fromorbit.com,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
Kent Overstreet <kent.overstreet@linux.dev>
Subject: Re: [PATCH 1/2] mm: Add memalloc_nowait_{save,restore}
Date: Mon, 12 Aug 2024 04:37:58 -0700 [thread overview]
Message-ID: <Zrn0FlBY-kYMftK4@infradead.org> (raw)
In-Reply-To: <20240812090525.80299-2-laoar.shao@gmail.com>
On Mon, Aug 12, 2024 at 05:05:24PM +0800, Yafang Shao wrote:
> The PF_MEMALLOC_NORECLAIM flag was introduced in commit eab0af905bfc
> ("mm: introduce PF_MEMALLOC_NORECLAIM, PF_MEMALLOC_NOWARN"). To complement
> this, let's add two helper functions, memalloc_nowait_{save,restore}, which
> will be useful in scenarios where we want to avoid waiting for memory
> reclamation.
No, forcing nowait on callee contets is just asking for trouble.
Unlike NOIO or NOFS this is incompatible with NOFAIL allocations
and thus will lead to kernel crashes.
next prev parent reply other threads:[~2024-08-12 11:38 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-12 9:05 [PATCH 0/2] mm: Add readahead support for IOCB_NOWAIT Yafang Shao
2024-08-12 9:05 ` [PATCH 1/2] mm: Add memalloc_nowait_{save,restore} Yafang Shao
2024-08-12 11:37 ` Christoph Hellwig [this message]
2024-08-12 12:59 ` Yafang Shao
2024-08-12 13:21 ` Christoph Hellwig
2024-08-13 2:09 ` Yafang Shao
2024-08-14 5:27 ` Christoph Hellwig
2024-08-14 7:33 ` Yafang Shao
2024-09-01 20:24 ` Vlastimil Babka
2024-09-01 20:42 ` Kent Overstreet
2024-08-14 7:42 ` Michal Hocko
2024-08-14 8:12 ` Yafang Shao
2024-08-14 12:43 ` Michal Hocko
2024-08-15 3:26 ` Yafang Shao
2024-08-15 6:22 ` Michal Hocko
2024-08-15 6:32 ` Yafang Shao
2024-08-15 6:51 ` Michal Hocko
2024-08-16 8:17 ` [PATCH] mm: document risk of PF_MEMALLOC_NORECLAIM Michal Hocko
2024-08-16 8:22 ` Christoph Hellwig
2024-08-16 8:54 ` Michal Hocko
2024-08-16 14:26 ` Christoph Hellwig
2024-08-16 15:57 ` Michal Hocko
2024-08-21 7:30 ` Michal Hocko
2024-08-21 11:44 ` Christoph Hellwig
2024-08-21 12:37 ` Michal Hocko
2024-08-22 9:09 ` Christian Brauner
2024-08-17 2:29 ` Yafang Shao
2024-08-19 7:57 ` Michal Hocko
2024-08-12 16:48 ` [PATCH 1/2] mm: Add memalloc_nowait_{save,restore} Kent Overstreet
2024-08-14 5:24 ` Christoph Hellwig
2024-08-14 0:28 ` Dave Chinner
2024-08-14 2:19 ` Yafang Shao
2024-08-14 5:42 ` Dave Chinner
2024-08-14 7:32 ` Yafang Shao
2024-08-15 2:54 ` Dave Chinner
2024-08-15 3:38 ` Yafang Shao
2024-08-12 9:05 ` [PATCH 2/2] mm: allow read-ahead with IOCB_NOWAIT set Yafang Shao
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