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From: Brian Foster <bfoster@redhat.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 04/28] xfs: Improve metadata buffer reclaim accountability
Date: Fri, 1 Nov 2019 08:05:13 -0400	[thread overview]
Message-ID: <20191101120513.GD59146@bfoster> (raw)
In-Reply-To: <20191031234618.15403-5-david@fromorbit.com>

On Fri, Nov 01, 2019 at 10:45:54AM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
> 
> The buffer cache shrinker frees more than just the xfs_buf slab
> objects - it also frees the pages attached to the buffers. Make sure
> the memory reclaim code accounts for this memory being freed
> correctly, similar to how the inode shrinker accounts for pages
> freed from the page cache due to mapping invalidation.
> 
> We also need to make sure that the mm subsystem knows these are
> reclaimable objects. We provide the memory reclaim subsystem with a
> a shrinker to reclaim xfs_bufs, so we should really mark the slab
> that way.
> 
> We also have a lot of xfs_bufs in a busy system, spread them around
> like we do inodes.
> 
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> ---

I still don't see why we wouldn't set the spread flag on the bli cache
as well, but afaict it doesn't matter in most cases unless the spread
knob is enabled. Unless I'm misunderstanding how that works, I think the
commit log could be improved to describe that since to me it implies the
flag by itself has an effect, but otherwise the change seems fine:

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/xfs_buf.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
> index 1e63dd3d1257..d34e5d2edacd 100644
> --- a/fs/xfs/xfs_buf.c
> +++ b/fs/xfs/xfs_buf.c
> @@ -324,6 +324,9 @@ xfs_buf_free(
>  
>  			__free_page(page);
>  		}
> +		if (current->reclaim_state)
> +			current->reclaim_state->reclaimed_slab +=
> +							bp->b_page_count;
>  	} else if (bp->b_flags & _XBF_KMEM)
>  		kmem_free(bp->b_addr);
>  	_xfs_buf_free_pages(bp);
> @@ -2061,7 +2064,8 @@ int __init
>  xfs_buf_init(void)
>  {
>  	xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf",
> -						KM_ZONE_HWALIGN, NULL);
> +			KM_ZONE_HWALIGN | KM_ZONE_SPREAD | KM_ZONE_RECLAIM,
> +			NULL);
>  	if (!xfs_buf_zone)
>  		goto out;
>  
> -- 
> 2.24.0.rc0
> 


  reply	other threads:[~2019-11-01 12:05 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-31 23:45 [PATCH 00/28] mm, xfs: non-blocking inode reclaim Dave Chinner
2019-10-31 23:45 ` [PATCH 01/28] xfs: Lower CIL flush limit for large logs Dave Chinner
2019-10-31 23:45 ` [PATCH 02/28] xfs: Throttle commits on delayed background CIL push Dave Chinner
2019-11-01 12:04   ` Brian Foster
2019-11-01 21:40     ` Dave Chinner
2019-11-04 22:48       ` Darrick J. Wong
2019-10-31 23:45 ` [PATCH 03/28] xfs: don't allow log IO to be throttled Dave Chinner
2019-10-31 23:45 ` [PATCH 04/28] xfs: Improve metadata buffer reclaim accountability Dave Chinner
2019-11-01 12:05   ` Brian Foster [this message]
2019-11-04 23:21   ` Darrick J. Wong
2019-10-31 23:45 ` [PATCH 05/28] xfs: correctly acount for reclaimable slabs Dave Chinner
2019-10-31 23:45 ` [PATCH 06/28] xfs: factor common AIL item deletion code Dave Chinner
2019-11-04 23:16   ` Darrick J. Wong
2019-10-31 23:45 ` [PATCH 07/28] xfs: tail updates only need to occur when LSN changes Dave Chinner
2019-11-04 23:18   ` Darrick J. Wong
2019-10-31 23:45 ` [PATCH 08/28] xfs: factor inode lookup from xfs_ifree_cluster Dave Chinner
2019-11-01 12:05   ` Brian Foster
2019-11-04 23:20   ` Darrick J. Wong
2019-10-31 23:45 ` [PATCH 09/28] mm: directed shrinker work deferral Dave Chinner
2019-11-04 15:25   ` Brian Foster
2019-11-14 20:49     ` Dave Chinner
2019-11-15 17:21       ` Brian Foster
2019-11-18  0:49         ` Dave Chinner
2019-11-19 15:12           ` Brian Foster
2019-10-31 23:46 ` [PATCH 10/28] shrinkers: use defer_work for GFP_NOFS sensitive shrinkers Dave Chinner
2019-10-31 23:46 ` [PATCH 11/28] mm: factor shrinker work calculations Dave Chinner
2019-11-02 10:55   ` kbuild test robot
2019-11-04 15:29   ` Brian Foster
2019-11-14 20:59     ` Dave Chinner
2019-10-31 23:46 ` [PATCH 12/28] shrinker: defer work only to kswapd Dave Chinner
2019-11-04 15:29   ` Brian Foster
2019-11-14 21:11     ` Dave Chinner
2019-11-15 17:23       ` Brian Foster
2019-10-31 23:46 ` [PATCH 13/28] shrinker: clean up variable types and tracepoints Dave Chinner
2019-11-04 15:30   ` Brian Foster
2019-10-31 23:46 ` [PATCH 14/28] mm: reclaim_state records pages reclaimed, not slabs Dave Chinner
2019-11-04 19:58   ` Brian Foster
2019-10-31 23:46 ` [PATCH 15/28] mm: back off direct reclaim on excessive shrinker deferral Dave Chinner
2019-11-04 19:58   ` Brian Foster
2019-11-14 21:28     ` Dave Chinner
2019-10-31 23:46 ` [PATCH 16/28] mm: kswapd backoff for shrinkers Dave Chinner
2019-11-04 19:58   ` Brian Foster
2019-11-14 21:41     ` Dave Chinner
2019-10-31 23:46 ` [PATCH 17/28] xfs: synchronous AIL pushing Dave Chinner
2019-11-05 17:05   ` Brian Foster
2019-10-31 23:46 ` [PATCH 18/28] xfs: don't block kswapd in inode reclaim Dave Chinner
2019-10-31 23:46 ` [PATCH 19/28] xfs: reduce kswapd blocking on inode locking Dave Chinner
2019-11-05 17:05   ` Brian Foster
2019-10-31 23:46 ` [PATCH 20/28] xfs: kill background reclaim work Dave Chinner
2019-11-05 17:05   ` Brian Foster
2019-10-31 23:46 ` [PATCH 21/28] xfs: use AIL pushing for inode reclaim IO Dave Chinner
2019-11-05 17:06   ` Brian Foster
2019-10-31 23:46 ` [PATCH 22/28] xfs: remove mode from xfs_reclaim_inodes() Dave Chinner
2019-10-31 23:46 ` [PATCH 23/28] xfs: track reclaimable inodes using a LRU list Dave Chinner
2019-10-31 23:46 ` [PATCH 24/28] xfs: reclaim inodes from the LRU Dave Chinner
2019-11-06 17:21   ` Brian Foster
2019-11-14 21:51     ` Dave Chinner
2019-10-31 23:46 ` [PATCH 25/28] xfs: remove unusued old inode reclaim code Dave Chinner
2019-11-06 17:21   ` Brian Foster
2019-10-31 23:46 ` [PATCH 26/28] xfs: use xfs_ail_push_all in xfs_reclaim_inodes Dave Chinner
2019-11-06 17:22   ` Brian Foster
2019-11-14 21:53     ` Dave Chinner
2019-10-31 23:46 ` [PATCH 27/28] rwsem: introduce down/up_write_non_owner Dave Chinner
2019-10-31 23:46 ` [PATCH 28/28] xfs: rework unreferenced inode lookups Dave Chinner
2019-11-06 22:18   ` Brian Foster
2019-11-14 22:16     ` Dave Chinner
2019-11-15 13:13       ` Christoph Hellwig
2019-11-15 17:26       ` Brian Foster
2019-11-18  1:00         ` Dave Chinner
2019-11-19 15:13           ` Brian Foster
2019-11-19 21:18             ` Dave Chinner
2019-11-20 12:42               ` Brian Foster

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