From: NeilBrown <neilb@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>,
Theodore Ts'o <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
"Darrick J. Wong" <djwong@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.com>,
". Dave Chinner" <david@fromorbit.com>,
Jonathan Corbet <corbet@lwn.net>
Cc: linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org
Subject: [PATCH 5/6] XFS: remove congestion_wait() loop from kmem_alloc()
Date: Fri, 17 Sep 2021 12:56:57 +1000 [thread overview]
Message-ID: <163184741781.29351.4475236694432020436.stgit@noble.brown> (raw)
In-Reply-To: <163184698512.29351.4735492251524335974.stgit@noble.brown>
Documentation commment in gfp.h discourages indefinite retry loops on
ENOMEM and says of __GFP_NOFAIL that it
is definitely preferable to use the flag rather than opencode
endless loop around allocator.
So remove the loop, instead specifying __GFP_NOFAIL if KM_MAYFAIL was
not given.
As we no longer have the opportunity to report a warning after some
failures, clear __GFP_NOWARN so that the default warning (rate-limited
to 1 ever 10 seconds) will be reported instead.
Signed-off-by: NeilBrown <neilb@suse.de>
---
fs/xfs/kmem.c | 19 ++++++-------------
1 file changed, 6 insertions(+), 13 deletions(-)
diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c
index 6f49bf39183c..575a58e61391 100644
--- a/fs/xfs/kmem.c
+++ b/fs/xfs/kmem.c
@@ -11,21 +11,14 @@
void *
kmem_alloc(size_t size, xfs_km_flags_t flags)
{
- int retries = 0;
gfp_t lflags = kmem_flags_convert(flags);
- void *ptr;
trace_kmem_alloc(size, flags, _RET_IP_);
- do {
- ptr = kmalloc(size, lflags);
- if (ptr || (flags & KM_MAYFAIL))
- return ptr;
- if (!(++retries % 100))
- xfs_err(NULL,
- "%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)",
- current->comm, current->pid,
- (unsigned int)size, __func__, lflags);
- congestion_wait(BLK_RW_ASYNC, HZ/50);
- } while (1);
+ if (!(flags & KM_MAYFAIL)) {
+ lflags |= __GFP_NOFAIL;
+ lflags &= ~__GFP_NOWARN;
+ }
+
+ return kmalloc(size, lflags);
}
next prev parent reply other threads:[~2021-09-17 3:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 2:56 [PATCH 0/6 v2] congestion_wait() and GFP_NOFAIL NeilBrown
2021-09-17 2:56 ` [PATCH 6/6] XFS: remove congestion_wait() loop from xfs_buf_alloc_pages() NeilBrown
2021-09-17 2:56 ` NeilBrown [this message]
2021-09-17 21:45 ` [PATCH 5/6] XFS: remove congestion_wait() loop from kmem_alloc() Dave Chinner
2021-09-17 2:56 ` [PATCH 1/6] MM: Support __GFP_NOFAIL in alloc_pages_bulk_*() and improve doco NeilBrown
2021-09-17 14:42 ` Mel Gorman
2021-09-20 23:48 ` NeilBrown
2021-10-05 9:16 ` Vlastimil Babka
2021-09-17 2:56 ` [PATCH 3/6] EXT4: Remove ENOMEM/congestion_wait() loops NeilBrown
2021-09-17 2:56 ` [PATCH 4/6] EXT4: remove congestion_wait from ext4_bio_write_page, and simplify NeilBrown
2021-09-17 2:56 ` [PATCH 2/6] MM: improve documentation for __GFP_NOFAIL NeilBrown
2021-10-05 9:20 ` Vlastimil Babka
2021-10-05 11:09 ` Michal Hocko
2021-10-05 12:27 ` Vlastimil Babka
2021-10-06 23:14 ` Dave Chinner
2021-10-07 10:07 ` Michal Hocko
2021-10-07 23:15 ` NeilBrown
2021-10-08 7:48 ` Michal Hocko
2021-10-08 22:36 ` Dave Chinner
2021-10-11 11:57 ` Michal Hocko
2021-10-11 21:49 ` NeilBrown
2021-10-18 10:23 ` Michal Hocko
2021-10-19 4:32 ` NeilBrown
2021-10-19 13:59 ` Michal Hocko
2021-10-22 0:09 ` NeilBrown
2021-10-13 2:32 ` Dave Chinner
2021-10-13 8:26 ` Michal Hocko
2021-10-14 11:32 ` David Sterba
2021-10-14 11:46 ` Michal Hocko
-- strict thread matches above, loose matches on Subject: below --
2021-09-14 0:13 [PATCH 0/6] congestion_wait() and GFP_NOFAIL NeilBrown
2021-09-14 0:13 ` [PATCH 5/6] XFS: remove congestion_wait() loop from kmem_alloc() NeilBrown
2021-09-14 1:31 ` Dave Chinner
2021-09-14 3:27 ` NeilBrown
2021-09-14 6:05 ` Dave Chinner
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