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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: sandeen@sandeen.net, darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org
Subject: [PATCH 0/5] xfsprogs: scrub filesystem summary counters
Date: Wed, 25 Sep 2019 14:31:05 -0700	[thread overview]
Message-ID: <156944706528.296129.7604742756772046951.stgit@magnolia> (raw)

Hi all,

This patch series introduces a totally new filesystem summary counter
online scrub feature.  Whereas previous iterations froze the filesystem
to count inodes and free blocks, this one drastically reduces overhead
by loosening its precision somewhat.  Instead of freezing the fs, we
race the expected summary counter calculation with normal fs operations
and use thresholding to check that the counters are in the ballpark,
where ballpark means "off by less than 6% or so".

If you're going to start using this mess, you probably ought to just
pull from my git trees, which are linked below.

This is an extraordinary way to destroy everything.  Enjoy!
Comments and questions are, as always, welcome.

--D

kernel git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=scrub-summary-counters

xfsprogs git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=scrub-summary-counters

             reply	other threads:[~2019-09-25 21:31 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-25 21:31 Darrick J. Wong [this message]
2019-09-25 21:31 ` [PATCH 1/5] xfs_scrub: remove unnecessary fd parameter from file scrubbers Darrick J. Wong
2019-09-25 21:31 ` [PATCH 2/5] libfrog: share scrub headers Darrick J. Wong
2019-09-25 21:31 ` [PATCH 3/5] libfrog: add online scrub/repair for superblock counters Darrick J. Wong
2019-09-25 21:31 ` [PATCH 4/5] xfs_scrub: separate internal metadata scrub functions Darrick J. Wong
2019-09-26 17:37   ` Eric Sandeen
2019-09-25 21:31 ` [PATCH 5/5] xfs_scrub: check summary counters Darrick J. Wong
  -- strict thread matches above, loose matches on Subject: below --
2019-09-06  3:33 [PATCH 0/5] xfsprogs: scrub filesystem " Darrick J. Wong

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