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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 13:43:55 +08:00
linux-next/fs/afs
David Howells 5a81327616 afs: Do better accretion of small writes on newly created content
Processes like ld that do lots of small writes that aren't necessarily
contiguous result in a lot of small StoreData operations to the server, the
idea being that if someone else changes the data on the server, we only
write our changes over that and not the space between.  Further, we don't
want to write back empty space if we can avoid it to make it easier for the
server to do sparse files.

However, making lots of tiny RPC ops is a lot less efficient for the server
than one big one because each op requires allocation of resources and the
taking of locks, so we want to compromise a bit.

Reduce the load by the following:

 (1) If a file is just created locally or has just been truncated with
     O_TRUNC locally, allow subsequent writes to the file to be merged with
     intervening space if that space doesn't cross an entire intervening
     page.

 (2) Don't flush the file on ->flush() but rather on ->release() if the
     file was open for writing.

Just linking vmlinux.o, without this patch, looking in /proc/fs/afs/stats:

	file-wr : n=441 nb=513581204

and after the patch:

	file-wr : n=62 nb=513668555

there were 379 fewer StoreData RPC operations at the expense of an extra
87K being written.

Signed-off-by: David Howells <dhowells@redhat.com>
2018-04-09 21:54:48 +01:00
..
addr_list.c afs: Fix checker warnings 2018-04-09 21:12:31 +01:00
afs_cm.h afs: support the CB.ProbeUuid RPC op 2008-04-29 08:06:26 -07:00
afs_fs.h afs: Prospectively look up extra files when doing a single lookup 2018-04-09 21:12:31 +01:00
afs_vl.h afs: Make use of the YFS service upgrade to fully support IPv6 2017-11-13 15:38:19 +00:00
afs.h afs: Rearrange status mapping 2018-04-09 21:53:59 +01:00
cache.c fscache: Pass object size in rather than calling back for it 2018-04-06 14:05:14 +01:00
callback.c afs: Do better accretion of small writes on newly created content 2018-04-09 21:54:48 +01:00
cell.c afs: Implement @cell substitution handling 2018-04-09 21:18:58 +01:00
cmservice.c afs: Trace protocol errors 2018-04-09 21:54:48 +01:00
dir_edit.c afs: Locally edit directory data for mkdir/create/unlink/... 2018-04-09 21:54:48 +01:00
dir.c afs: Do better accretion of small writes on newly created content 2018-04-09 21:54:48 +01:00
dynroot.c afs: Split the dynroot stuff out and give it its own ops tables 2018-04-09 21:54:00 +01:00
file.c afs: Do better accretion of small writes on newly created content 2018-04-09 21:54:48 +01:00
flock.c afs: Make it possible to get the data version in readpage 2018-04-09 21:53:56 +01:00
fsclient.c afs: Trace protocol errors 2018-04-09 21:54:48 +01:00
inode.c afs: Trace protocol errors 2018-04-09 21:54:48 +01:00
internal.h afs: Do better accretion of small writes on newly created content 2018-04-09 21:54:48 +01:00
Kconfig fs/afs: remove depends on CONFIG_EXPERIMENTAL 2013-01-21 14:39:04 -08:00
main.c afs: Implement @sys substitution handling 2018-04-09 21:12:31 +01:00
Makefile afs: Locally edit directory data for mkdir/create/unlink/... 2018-04-09 21:54:48 +01:00
misc.c afs: Consolidate abort_to_error translators 2017-11-13 15:38:17 +00:00
mntpt.c afs: Support the AFS dynamic root 2018-02-06 14:43:37 +00:00
netdevices.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
proc.c afs: Add stats for data transfer operations 2018-04-09 21:54:48 +01:00
rotate.c afs: Fix checker warnings 2018-04-09 21:12:31 +01:00
rxrpc.c afs: Trace protocol errors 2018-04-09 21:54:48 +01:00
security.c afs: Make it possible to get the data version in readpage 2018-04-09 21:53:56 +01:00
server_list.c afs: Fix server list handling 2018-02-06 14:36:54 +00:00
server.c afs: Fix checker warnings 2018-04-09 21:12:31 +01:00
super.c afs: Split the dynroot stuff out and give it its own ops tables 2018-04-09 21:54:00 +01:00
vlclient.c afs: Trace protocol errors 2018-04-09 21:54:48 +01:00
volume.c fscache: Pass object size in rather than calling back for it 2018-04-06 14:05:14 +01:00
write.c afs: Do better accretion of small writes on newly created content 2018-04-09 21:54:48 +01:00
xattr.c afs: Overhaul volume and server record caching and fileserver rotation 2017-11-13 15:38:19 +00:00
xdr_fs.h afs: Adjust the directory XDR structures 2018-04-09 21:54:48 +01:00