From: Allison Henderson <allison.henderson@oracle.com>
To: Chandan Babu R <chandanrlinux@gmail.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v24 05/11] RFC xfs: Skip flip flags for delayed attrs
Date: Tue, 31 Aug 2021 11:11:56 -0700 [thread overview]
Message-ID: <0a5de6a9-0109-9555-41d2-491116caa8d4@oracle.com> (raw)
In-Reply-To: <87bl5f9r28.fsf@debian-BULLSEYE-live-builder-AMD64>
On 8/30/21 3:15 AM, Chandan Babu R wrote:
> On 25 Aug 2021 at 04:14, Allison Henderson wrote:
>> This is a clean up patch that skips the flip flag logic for delayed attr
>> renames. Since the log replay keeps the inode locked, we do not need to
>> worry about race windows with attr lookups. So we can skip over
>> flipping the flag and the extra transaction roll for it
>>
>> RFC: In the last review, folks asked for some performance analysis, so I
>> did a few perf captures with and with out this patch. What I found was
>> that there wasnt very much difference at all between having the patch or
>> not having it. Of the time we do spend in the affected code, the
>> percentage is small. Most of the time we spend about %0.03 of the time
>> in this function, with or with out the patch. Occasionally we get a
>> 0.02%, though not often. So I think this starts to challenge needing
>> this patch at all. This patch was requested some number of reviews ago,
>> be perhaps in light of the findings, it may no longer be of interest.
>>
>> 0.03% 0.00% fsstress [xfs] [k] xfs_attr_set_iter
>>
>> Keep it or drop it?
>
> Looks good to me.
>
> Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Ok, thank you!
Allison
>
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
>> ---
>> fs/xfs/libxfs/xfs_attr.c | 54 +++++++++++++++++++++--------------
>> fs/xfs/libxfs/xfs_attr_leaf.c | 3 +-
>> 2 files changed, 35 insertions(+), 22 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
>> index dfff81024e46..fce67c717be2 100644
>> --- a/fs/xfs/libxfs/xfs_attr.c
>> +++ b/fs/xfs/libxfs/xfs_attr.c
>> @@ -355,6 +355,7 @@ xfs_attr_set_iter(
>> struct xfs_inode *dp = args->dp;
>> struct xfs_buf *bp = NULL;
>> int forkoff, error = 0;
>> + struct xfs_mount *mp = args->dp->i_mount;
>>
>> /* State machine switch */
>> switch (dac->dela_state) {
>> @@ -477,16 +478,21 @@ xfs_attr_set_iter(
>> * In a separate transaction, set the incomplete flag on the
>> * "old" attr and clear the incomplete flag on the "new" attr.
>> */
>> - error = xfs_attr3_leaf_flipflags(args);
>> - if (error)
>> - return error;
>> - /*
>> - * Commit the flag value change and start the next trans in
>> - * series.
>> - */
>> - dac->dela_state = XFS_DAS_FLIP_LFLAG;
>> - trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
>> - return -EAGAIN;
>> + if (!xfs_has_larp(mp)) {
>> + error = xfs_attr3_leaf_flipflags(args);
>> + if (error)
>> + return error;
>> + /*
>> + * Commit the flag value change and start the next trans
>> + * in series.
>> + */
>> + dac->dela_state = XFS_DAS_FLIP_LFLAG;
>> + trace_xfs_attr_set_iter_return(dac->dela_state,
>> + args->dp);
>> + return -EAGAIN;
>> + }
>> +
>> + /* fallthrough */
>> case XFS_DAS_FLIP_LFLAG:
>> /*
>> * Dismantle the "old" attribute/value pair by removing a
>> @@ -589,17 +595,21 @@ xfs_attr_set_iter(
>> * In a separate transaction, set the incomplete flag on the
>> * "old" attr and clear the incomplete flag on the "new" attr.
>> */
>> - error = xfs_attr3_leaf_flipflags(args);
>> - if (error)
>> - goto out;
>> - /*
>> - * Commit the flag value change and start the next trans in
>> - * series
>> - */
>> - dac->dela_state = XFS_DAS_FLIP_NFLAG;
>> - trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
>> - return -EAGAIN;
>> + if (!xfs_has_larp(mp)) {
>> + error = xfs_attr3_leaf_flipflags(args);
>> + if (error)
>> + goto out;
>> + /*
>> + * Commit the flag value change and start the next trans
>> + * in series
>> + */
>> + dac->dela_state = XFS_DAS_FLIP_NFLAG;
>> + trace_xfs_attr_set_iter_return(dac->dela_state,
>> + args->dp);
>> + return -EAGAIN;
>> + }
>>
>> + /* fallthrough */
>> case XFS_DAS_FLIP_NFLAG:
>> /*
>> * Dismantle the "old" attribute/value pair by removing a
>> @@ -1236,6 +1246,7 @@ xfs_attr_node_addname_clear_incomplete(
>> {
>> struct xfs_da_args *args = dac->da_args;
>> struct xfs_da_state *state = NULL;
>> + struct xfs_mount *mp = args->dp->i_mount;
>> int retval = 0;
>> int error = 0;
>>
>> @@ -1243,7 +1254,8 @@ xfs_attr_node_addname_clear_incomplete(
>> * Re-find the "old" attribute entry after any split ops. The INCOMPLETE
>> * flag means that we will find the "old" attr, not the "new" one.
>> */
>> - args->attr_filter |= XFS_ATTR_INCOMPLETE;
>> + if (!xfs_has_larp(mp))
>> + args->attr_filter |= XFS_ATTR_INCOMPLETE;
>> state = xfs_da_state_alloc(args);
>> state->inleaf = 0;
>> error = xfs_da3_node_lookup_int(state, &retval);
>> diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
>> index e1d11e314228..a0a352bdea59 100644
>> --- a/fs/xfs/libxfs/xfs_attr_leaf.c
>> +++ b/fs/xfs/libxfs/xfs_attr_leaf.c
>> @@ -1487,7 +1487,8 @@ xfs_attr3_leaf_add_work(
>> if (tmp)
>> entry->flags |= XFS_ATTR_LOCAL;
>> if (args->op_flags & XFS_DA_OP_RENAME) {
>> - entry->flags |= XFS_ATTR_INCOMPLETE;
>> + if (!xfs_has_larp(mp))
>> + entry->flags |= XFS_ATTR_INCOMPLETE;
>> if ((args->blkno2 == args->blkno) &&
>> (args->index2 <= args->index)) {
>> args->index2++;
>
>
next prev parent reply other threads:[~2021-08-31 18:12 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 22:44 [PATCH v24 00/11] Log Attribute Replay Allison Henderson
2021-08-24 22:44 ` [PATCH v24 01/11] xfs: Return from xfs_attr_set_iter if there are no more rmtblks to process Allison Henderson
2021-08-24 22:44 ` [PATCH v24 02/11] xfs: Capture buffers for delayed ops Allison Henderson
2021-08-27 11:33 ` Chandan Babu R
2021-08-31 18:03 ` Allison Henderson
2021-08-30 17:44 ` Darrick J. Wong
2021-08-31 17:50 ` Allison Henderson
2021-09-18 0:02 ` Darrick J. Wong
2021-08-24 22:44 ` [PATCH v24 03/11] xfs: Set up infrastructure for log atrribute replay Allison Henderson
2021-08-27 14:17 ` Chandan Babu R
2021-08-31 18:03 ` Allison Henderson
2021-08-31 0:48 ` Dave Chinner
2021-08-31 19:03 ` Allison Henderson
2021-08-31 21:52 ` Dave Chinner
2021-09-01 5:34 ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 04/11] xfs: Implement attr logging and replay Allison Henderson
2021-08-30 7:47 ` Chandan Babu R
2021-08-31 18:11 ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 05/11] RFC xfs: Skip flip flags for delayed attrs Allison Henderson
2021-08-30 10:15 ` Chandan Babu R
2021-08-31 18:11 ` Allison Henderson [this message]
2021-08-24 22:44 ` [PATCH v24 06/11] xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred Allison Henderson
2021-08-30 10:27 ` Chandan Babu R
2021-08-31 18:12 ` Allison Henderson
2021-09-01 3:47 ` Dave Chinner
2021-09-01 5:34 ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 07/11] xfs: Remove unused xfs_attr_*_args Allison Henderson
2021-08-24 22:44 ` [PATCH v24 08/11] xfs: Add log attribute error tag Allison Henderson
2021-08-24 22:44 ` [PATCH v24 09/11] xfs: Add larp debug option Allison Henderson
2021-08-30 12:03 ` Chandan Babu R
2021-08-31 18:12 ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 10/11] xfs: Merge xfs_delattr_context into xfs_attr_item Allison Henderson
2021-08-24 22:44 ` [PATCH v24 11/11] xfs: Add helper function xfs_attr_leaf_addname Allison Henderson
2021-08-30 14:17 ` Chandan Babu R
2021-08-31 18:13 ` Allison Henderson
2021-08-31 0:20 ` [PATCH v24 00/11] Log Attribute Replay Dave Chinner
2021-08-31 18:27 ` Allison Henderson
2021-09-01 6:29 ` Dave Chinner
2021-09-01 7:30 ` [PATCH 0/5] xfs: various logged attribute fixes Dave Chinner
2021-09-01 7:30 ` [PATCH 1/5] xfs: fix fallthrough annotations in xfs_attr_set_iter() Dave Chinner
2021-09-01 7:30 ` [PATCH 2/5] xfs: fix flags passed to kvmalloc() by xfs_attri_init() Dave Chinner
2021-09-01 7:30 ` [PATCH 3/5] xfs: hide log iovec alignment constraints Dave Chinner
2021-09-01 7:30 ` [PATCH 4/5] xfs: fix attribute log iovec sizing Dave Chinner
2021-09-01 7:30 ` [PATCH 5/5] [RFC] xfs: don't commit the first deferred transaction without intents Dave Chinner
2021-09-01 21:43 ` [PATCH 0/5] xfs: various logged attribute fixes Allison Henderson
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