From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 24/24] xfs: remove xfs_inobp_check()
Date: Fri, 22 May 2020 17:16:10 -0700 [thread overview]
Message-ID: <20200523001610.GA8230@magnolia> (raw)
In-Reply-To: <20200522035029.3022405-25-david@fromorbit.com>
On Fri, May 22, 2020 at 01:50:29PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> This debug code is called on every xfs_iflush() call, which then
> checks every inode in the buffer for non-zero unlinked list field.
> Hence it checks every inode in the cluster buffer every time a
> single inode on that cluster it flushed. This is resulting in:
>
> - 38.91% 5.33% [kernel] [k] xfs_iflush ▒
> - 17.70% xfs_iflush ▒
> - 9.93% xfs_inobp_check ▒
> 4.36% xfs_buf_offset ▒
Overly long lines there ^^^^^.
>
> 10% of the CPU time spent flushing inodes is repeatedly checking
> unlinked fields in the buffer. We don't need to do this.
>
> The other place we call xfs_inobp_check() is
> xfs_iunlink_update_dinode(), and this is after we've done this
> assert for the agino we are about to write into that inode:
>
> ASSERT(xfs_verify_agino_or_null(mp, agno, next_agino));
>
> which means we've already checked that the agino we are about to
> write is not 0 on debug kernels. The inode buffer verifiers do
> everything else we need, so let's just remove this debug code.
>
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
But with that fixed up,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
--D
> ---
> fs/xfs/libxfs/xfs_inode_buf.c | 24 ------------------------
> fs/xfs/libxfs/xfs_inode_buf.h | 6 ------
> fs/xfs/xfs_inode.c | 2 --
> 3 files changed, 32 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
> index 1af97235785c8..6b6f67595bf4e 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.c
> +++ b/fs/xfs/libxfs/xfs_inode_buf.c
> @@ -20,30 +20,6 @@
>
> #include <linux/iversion.h>
>
> -/*
> - * Check that none of the inode's in the buffer have a next
> - * unlinked field of 0.
> - */
> -#if defined(DEBUG)
> -void
> -xfs_inobp_check(
> - xfs_mount_t *mp,
> - xfs_buf_t *bp)
> -{
> - int i;
> - xfs_dinode_t *dip;
> -
> - for (i = 0; i < M_IGEO(mp)->inodes_per_cluster; i++) {
> - dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
> - if (!dip->di_next_unlinked) {
> - xfs_alert(mp,
> - "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
> - i, (long long)bp->b_bn);
> - }
> - }
> -}
> -#endif
> -
> /*
> * If we are doing readahead on an inode buffer, we might be in log recovery
> * reading an inode allocation buffer that hasn't yet been replayed, and hence
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
> index 865ac493c72a2..6b08b9d060c2e 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.h
> +++ b/fs/xfs/libxfs/xfs_inode_buf.h
> @@ -52,12 +52,6 @@ int xfs_inode_from_disk(struct xfs_inode *ip, struct xfs_dinode *from);
> void xfs_log_dinode_to_disk(struct xfs_log_dinode *from,
> struct xfs_dinode *to);
>
> -#if defined(DEBUG)
> -void xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
> -#else
> -#define xfs_inobp_check(mp, bp)
> -#endif /* DEBUG */
> -
> xfs_failaddr_t xfs_dinode_verify(struct xfs_mount *mp, xfs_ino_t ino,
> struct xfs_dinode *dip);
> xfs_failaddr_t xfs_inode_validate_extsize(struct xfs_mount *mp,
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index 7db0f97e537e3..98a494e42aa6a 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -2146,7 +2146,6 @@ xfs_iunlink_update_dinode(
> xfs_dinode_calc_crc(mp, dip);
> xfs_trans_inode_buf(tp, ibp);
> xfs_trans_log_buf(tp, ibp, offset, offset + sizeof(xfs_agino_t) - 1);
> - xfs_inobp_check(mp, ibp);
> }
>
> /* Set an in-core inode's unlinked pointer and return the old value. */
> @@ -3538,7 +3537,6 @@ xfs_iflush(
> xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
> if (XFS_IFORK_Q(ip))
> xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
> - xfs_inobp_check(mp, bp);
>
> /*
> * We've recorded everything logged in the inode, so we'd like to clear
> --
> 2.26.2.761.g0e0b3e54be
>
next prev parent reply other threads:[~2020-05-23 0:16 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-22 3:50 [PATCH 00/24] xfs: rework inode flushing to make inode reclaim fully asynchronous Dave Chinner
2020-05-22 3:50 ` [PATCH 01/24] xfs: remove logged flag from inode log item Dave Chinner
2020-05-22 7:25 ` Christoph Hellwig
2020-05-22 21:13 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 02/24] xfs: add an inode item lock Dave Chinner
2020-05-22 6:45 ` Amir Goldstein
2020-05-22 21:24 ` Darrick J. Wong
2020-05-23 8:45 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 03/24] xfs: mark inode buffers in cache Dave Chinner
2020-05-22 7:45 ` Amir Goldstein
2020-05-22 21:35 ` Darrick J. Wong
2020-05-24 23:41 ` Dave Chinner
2020-05-23 8:48 ` Christoph Hellwig
2020-05-25 0:06 ` Dave Chinner
2020-05-22 3:50 ` [PATCH 04/24] xfs: mark dquot " Dave Chinner
2020-05-22 7:46 ` Amir Goldstein
2020-05-22 21:38 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 05/24] xfs: mark log recovery buffers for completion Dave Chinner
2020-05-22 7:41 ` Amir Goldstein
2020-05-24 23:54 ` Dave Chinner
2020-05-22 21:41 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 06/24] xfs: call xfs_buf_iodone directly Dave Chinner
2020-05-22 7:56 ` Amir Goldstein
2020-05-22 21:53 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 07/24] xfs: clean up whacky buffer log item list reinit Dave Chinner
2020-05-22 22:01 ` Darrick J. Wong
2020-05-23 8:50 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 08/24] xfs: fold xfs_istale_done into xfs_iflush_done Dave Chinner
2020-05-22 22:10 ` Darrick J. Wong
2020-05-23 9:12 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 09/24] xfs: use direct calls for dquot IO completion Dave Chinner
2020-05-22 22:13 ` Darrick J. Wong
2020-05-23 9:16 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 10/24] xfs: clean up the buffer iodone callback functions Dave Chinner
2020-05-22 22:26 ` Darrick J. Wong
2020-05-25 0:37 ` Dave Chinner
2020-05-23 9:19 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 11/24] xfs: get rid of log item callbacks Dave Chinner
2020-05-22 22:27 ` Darrick J. Wong
2020-05-23 9:19 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 12/24] xfs: pin inode backing buffer to the inode log item Dave Chinner
2020-05-22 22:39 ` Darrick J. Wong
2020-05-23 9:34 ` Christoph Hellwig
2020-05-23 21:43 ` Dave Chinner
2020-05-24 5:31 ` Christoph Hellwig
2020-05-24 23:13 ` Dave Chinner
2020-05-22 3:50 ` [PATCH 13/24] xfs: make inode reclaim almost non-blocking Dave Chinner
2020-05-22 12:19 ` Amir Goldstein
2020-05-22 22:48 ` Darrick J. Wong
2020-05-23 22:29 ` Dave Chinner
2020-05-22 3:50 ` [PATCH 14/24] xfs: remove IO submission from xfs_reclaim_inode() Dave Chinner
2020-05-22 23:06 ` Darrick J. Wong
2020-05-25 3:49 ` Dave Chinner
2020-05-23 9:40 ` Christoph Hellwig
2020-05-23 22:35 ` Dave Chinner
2020-05-22 3:50 ` [PATCH 15/24] xfs: allow multiple reclaimers per AG Dave Chinner
2020-05-22 23:10 ` Darrick J. Wong
2020-05-23 22:35 ` Dave Chinner
2020-05-22 3:50 ` [PATCH 16/24] xfs: don't block inode reclaim on the ILOCK Dave Chinner
2020-05-22 23:11 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 17/24] xfs: remove SYNC_TRYLOCK from inode reclaim Dave Chinner
2020-05-22 23:14 ` Darrick J. Wong
2020-05-23 22:42 ` Dave Chinner
2020-05-22 3:50 ` [PATCH 18/24] xfs: clean up inode reclaim comments Dave Chinner
2020-05-22 23:17 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 19/24] xfs: attach inodes to the cluster buffer when dirtied Dave Chinner
2020-05-22 23:48 ` Darrick J. Wong
2020-05-23 22:59 ` Dave Chinner
2020-05-22 3:50 ` [PATCH 20/24] xfs: xfs_iflush() is no longer necessary Dave Chinner
2020-05-22 23:54 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 21/24] xfs: rename xfs_iflush_int() Dave Chinner
2020-05-22 12:33 ` Amir Goldstein
2020-05-22 23:57 ` Darrick J. Wong
2020-05-22 3:50 ` [PATCH 22/24] xfs: rework xfs_iflush_cluster() dirty inode iteration Dave Chinner
2020-05-23 0:13 ` Darrick J. Wong
2020-05-23 23:14 ` Dave Chinner
2020-05-23 11:31 ` Christoph Hellwig
2020-05-23 23:23 ` Dave Chinner
2020-05-24 5:32 ` Christoph Hellwig
2020-05-23 11:39 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 23/24] xfs: factor xfs_iflush_done Dave Chinner
2020-05-23 0:20 ` Darrick J. Wong
2020-05-23 11:35 ` Christoph Hellwig
2020-05-22 3:50 ` [PATCH 24/24] xfs: remove xfs_inobp_check() Dave Chinner
2020-05-23 0:16 ` Darrick J. Wong [this message]
2020-05-23 11:36 ` Christoph Hellwig
2020-05-22 4:04 ` [PATCH 00/24] xfs: rework inode flushing to make inode reclaim fully asynchronous Dave Chinner
2020-05-23 16:18 ` Darrick J. Wong
2020-05-23 21:22 ` Dave Chinner
2020-05-22 6:18 ` Amir Goldstein
2020-05-22 12:01 ` Amir Goldstein
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