All of
 help / color / mirror / Atom feed
From: Jan Kara <>
To: Ted Tso <>
Cc: <>, Jan Kara <>
Subject: [PATCH 0/5 v6] ext4: Speedup orphan file handling
Date: Mon, 16 Aug 2021 11:22:58 +0200	[thread overview]
Message-ID: <> (raw)


Here is a fourth version of my series to speed up orphan inode handling in

Orphan inode handling in ext4 is a bottleneck for workloads which heavily
excercise truncate / unlink of small files as they contend on global
s_orphan_mutex (when you have fast enough storage). This patch set implements
new way of handling orphan inodes - instead of using a linked list, we store
inode numbers of orphaned inodes in a file which is possible to implement in a
more scalable manner than linked list manipulations. See description of patch
3/5 for more details.

The patch set achieves significant gains both for a micro benchmark stressing
orphan inode handling (truncating file byte-by-byte, several threads in
parallel) and for reaim creat_clo workload. I'm happy for any review, thoughts,
ideas about the patches. I have also implemented full support in e2fsprogs
which I'll send separately.



Changes since v5:
* Added Reviewed-by tags from Ted
* Fixed up sparse warning spotted by 0-day
* Fixed error handling path in ext4_orphan_add() to not leak orphan entry

Changes since v4:
* Rebased on top of v5.14-rc5
* Updated commit message of patch 1/5
* Added Reviewed-by tags from Ted

Changes since v3:
* Added documentation about on-disk format changes
* Add physical block number into orphan block checksum
* Improve some sanity checks, handling of corrupted orphan file
* Improved some changelogs

Changes since v2:
* Updated some comments
* Rebased onto 5.13-rc5
* Change orphan file inode from a fixed inode number to inode number stored
  in the superblock

Changes since v1:
* orphan blocks have now magic numbers
* split out orphan handling to a separate source file
* some smaller updates according to review

Previous versions:
Link: # v5
Link: #v4
Link: #v3
Link: #v2

             reply	other threads:[~2021-08-16  9:23 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16  9:22 Jan Kara [this message]
2021-08-16  9:22 ` [PATCH 1/5] ext4: Support for checksumming from journal triggers Jan Kara
2021-08-16  9:23 ` [PATCH 2/5] ext4: Move orphan inode handling into a separate file Jan Kara
2021-08-16  9:23 ` [PATCH 3/5] ext4: Speedup ext4 orphan inode handling Jan Kara
2021-08-16  9:23 ` [PATCH 4/5] ext4: Orphan file documentation Jan Kara
2021-08-16  9:23 ` [PATCH 5/5] ext4: Improve scalability of ext4 orphan file handling Jan Kara
2021-08-16  9:58 ` [PATCH 0/5 v6] ext4: Speedup " Jan Kara

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:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \
    --subject='Re: [PATCH 0/5 v6] ext4: Speedup orphan file handling' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.