From: Brian Foster <bfoster@redhat.com>
To: linux-fsdevel@vger.kernel.org
Cc: linux-xfs@vger.kernel.org
Subject: [PATCH v2 2/2] xfs: kick extra large ioends to completion workqueue
Date: Mon, 5 Oct 2020 11:21:02 -0400 [thread overview]
Message-ID: <20201005152102.15797-1-bfoster@redhat.com> (raw)
In-Reply-To: <20201002153357.56409-3-bfoster@redhat.com>
We've had reports of soft lockup warnings in the iomap ioend
completion path due to very large bios and/or bio chains. Divert any
ioends with 256k or more pages to process to the workqueue so
completion occurs in non-atomic context and can reschedule to avoid
soft lockup warnings.
Signed-off-by: Brian Foster <bfoster@redhat.com>
---
v2:
- Fix type in macro.
fs/xfs/xfs_aops.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 3e061ea99922..c00cc0624986 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -30,6 +30,13 @@ XFS_WPC(struct iomap_writepage_ctx *ctx)
return container_of(ctx, struct xfs_writepage_ctx, ctx);
}
+/*
+ * Kick extra large ioends off to the workqueue. Completion will process a lot
+ * of pages for a large bio or bio chain and a non-atomic context is required to
+ * reschedule and avoid soft lockup warnings.
+ */
+#define XFS_LARGE_IOEND (262144ULL << PAGE_SHIFT)
+
/*
* Fast and loose check if this write could update the on-disk inode size.
*/
@@ -239,7 +246,8 @@ static inline bool xfs_ioend_needs_workqueue(struct iomap_ioend *ioend)
{
return ioend->io_private ||
ioend->io_type == IOMAP_UNWRITTEN ||
- (ioend->io_flags & IOMAP_F_SHARED);
+ (ioend->io_flags & IOMAP_F_SHARED) ||
+ (ioend->io_size >= XFS_LARGE_IOEND);
}
STATIC void
--
2.25.4
next prev parent reply other threads:[~2020-10-05 15:21 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-02 15:33 [PATCH 0/2] iomap: avoid soft lockup warnings on large ioends Brian Foster
2020-10-02 15:33 ` [PATCH 1/2] iomap: resched ioend completion when in non-atomic context Brian Foster
2020-10-02 15:33 ` [PATCH 2/2] xfs: kick extra large ioends to completion workqueue Brian Foster
2020-10-02 16:19 ` Darrick J. Wong
2020-10-02 16:38 ` Brian Foster
2020-10-03 0:26 ` kernel test robot
2020-10-05 15:21 ` Brian Foster [this message]
2020-10-06 3:55 ` [PATCH v2 " Darrick J. Wong
2020-10-06 12:44 ` Brian Foster
2021-05-06 19:31 ` Darrick J. Wong
2021-05-07 14:06 ` Brian Foster
2021-05-07 14:40 ` Matthew Wilcox
2021-05-10 2:45 ` Dave Chinner
2020-10-06 14:07 ` Matthew Wilcox
2021-05-06 19:34 ` Darrick J. Wong
2021-05-06 19:45 ` Matthew Wilcox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201005152102.15797-1-bfoster@redhat.com \
--to=bfoster@redhat.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-xfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).