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a527c3ba41
linux/fs/nfs
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Jan Kara a527c3ba41 nfs: Avoid flushing many pages with NFS_FILE_SYNC 
When we are doing WB_SYNC_ALL writeback, nfs submits write requests with
NFS_FILE_SYNC flag to the server (which then generally treats it as an
O_SYNC write). This helps to reduce latency for single requests but when
submitting more requests, additional fsyncs on the server side hurt
latency. NFS generally avoids this additional overhead by not setting
NFS_FILE_SYNC if desc->pg_moreio is set.

However this logic doesn't always work. When we do random 4k writes to a huge
file and then call fsync(2), each page writeback is going to be sent with
NFS_FILE_SYNC because after preparing one page for writeback, we start writing
back next, nfs_do_writepage() will call nfs_pageio_cond_complete() which finds
the page is not contiguous with previously prepared IO and submits is *without*
setting desc->pg_moreio.  Hence NFS_FILE_SYNC is used resulting in poor
performance.

Fix the problem by setting desc->pg_moreio in nfs_pageio_cond_complete() before
submitting outstanding IO. This improves throughput of
fsync-after-random-writes on my test SSD from ~70MB/s to ~250MB/s.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2024-05-24 12:26:14 -04:00
..
blocklayout nfs: port block device access to files 2024-02-25 12:05:26 +01:00
filelayout pNFS: rework pnfs_generic_pg_check_layout to check IO range 2024-05-21 08:34:15 -04:00
flexfilelayout pNFS: rework pnfs_generic_pg_check_layout to check IO range 2024-05-21 08:34:15 -04:00
cache_lib.c
cache_lib.h
callback_proc.c NFSv4.1: if referring calls are complete, trust the stateid argument 2024-01-04 10:47:56 -05:00
callback_xdr.c NFSv4.1: Use the nfs_client's rpc timeouts for backchannel 2024-01-04 17:01:01 -05:00
callback.c nfsd: stop setting ->pg_stats for unused stats 2024-03-01 09:12:08 -05:00
callback.h NFS Client Updates for Linux 6.8 2024-01-10 16:13:57 -08:00
client.c NFS: remove unused variable nfs_rpcstat 2024-03-09 09:14:51 -05:00
delegation.c NFS client updates for Linux 6.9 2024-03-16 11:44:00 -07:00
delegation.h NFSv4: fairly test all delegations on a SEQ4_ revocation 2023-11-01 15:15:52 -04:00
dir.c NFS: add atomic_open for NFSv3 to handle O_TRUNC correctly. 2024-05-20 11:09:20 -04:00
direct.c NFS client updates for Linux 6.9 2024-03-16 11:44:00 -07:00
dns_resolve.c NFS: Move common includes outside ifdef 2023-08-24 13:24:15 -04:00
dns_resolve.h NFS: Avoid memcpy() run-time warning for struct sockaddr overflows 2022-10-27 15:52:10 -04:00
export.c nfsd: allow reaping files still under writeback 2023-04-26 09:04:59 -04:00
file.c nfs: adapt to breakup of struct file_lock 2024-02-05 13:11:43 +01:00
fs_context.c nfs: keep server info for remounts 2024-05-20 11:37:15 -04:00
fscache.c NFS: Fix nfs_netfs_issue_read() xarray locking for writeback interrupt 2024-03-09 09:14:38 -05:00
fscache.h netfs: Optimise away reads above the point at which there can be no data 2023-12-28 09:45:27 +00:00
getroot.c NFS: Remove the nfs4_label argument from nfs_setsecurity 2021-11-05 14:54:40 -04:00
inode.c NFS client bugfixes for Linux 6.9 2024-04-29 12:07:37 -07:00
internal.h nfs: fix undefined behavior in nfs_block_bits() 2024-05-21 08:34:15 -04:00
io.c
iostat.h NFS: Remove all NFSIOS_FSCACHE counters due to conversion to netfs API 2023-04-11 13:08:26 -04:00
Kconfig NFS: Don't enable NFS v2 by default 2024-05-20 11:37:15 -04:00
Makefile nfs: Convert to new fscache volume/cookie API 2022-01-10 11:53:25 +00:00
mount_clnt.c NFS: Avoid memcpy() run-time warning for struct sockaddr overflows 2022-10-27 15:52:10 -04:00
namespace.c fs: pass the request_mask to generic_fillattr 2023-08-09 08:56:36 +02:00
netns.h nfs: make the rpc_stat per net namespace 2024-03-09 09:14:51 -05:00
nfs2super.c
nfs2xdr.c NFS: Guard against READDIR loop when entry names exceed MAXNAMELEN 2023-08-30 11:08:27 -04:00
nfs3_fs.h fs: drop unused posix acl handlers 2023-03-06 09:57:12 +01:00
nfs3acl.c Mainly singleton patches all over the place. Series of note are: 2023-04-27 19:57:00 -07:00
nfs3client.c NFS: enable nconnect for RDMA 2024-03-09 09:14:51 -05:00
nfs3proc.c NFS: add atomic_open for NFSv3 to handle O_TRUNC correctly. 2024-05-20 11:09:20 -04:00
nfs3super.c fs: drop unused posix acl handlers 2023-03-06 09:57:12 +01:00
nfs3xdr.c NFS: Guard against READDIR loop when entry names exceed MAXNAMELEN 2023-08-30 11:08:27 -04:00
nfs4_fs.h NFS client updates for Linux 6.9 2024-03-16 11:44:00 -07:00
nfs4client.c NFS: enable nconnect for RDMA 2024-03-09 09:14:51 -05:00
nfs4file.c filelock: split leases out of struct file_lock 2024-02-05 13:11:44 +01:00
nfs4getroot.c
nfs4idmap.c cred: Do not default to init_cred in prepare_kernel_cred() 2022-11-01 10:04:52 -07:00
nfs4idmap.h
nfs4namespace.c NFS: Avoid memcpy() run-time warning for struct sockaddr overflows 2022-10-27 15:52:10 -04:00
nfs4proc.c NFSv4: Fix memory leak in nfs4_set_security_label 2024-05-22 11:27:04 -04:00
nfs4renewd.c
nfs4session.c NFSv4: Sanity check the parameters in nfs41_update_target_slotid() 2021-11-07 09:23:14 -05:00
nfs4session.h NFSv4: Sanity check the parameters in nfs41_update_target_slotid() 2021-11-07 09:23:14 -05:00
nfs4state.c NFSv4: Fixup smatch warning for ambiguous return 2024-05-20 11:12:59 -04:00
nfs4super.c nfs: fix regression in handling of fsc= option in NFSv4 2024-02-28 16:18:19 -05:00
nfs4sysctl.c fs: Remove the now superfluous sentinel elements from ctl_table array 2023-12-28 04:57:57 -08:00
nfs4trace.c pnfs/filelayout: add tracepoint to getdeviceinfo 2024-02-28 16:18:19 -05:00
nfs4trace.h NFS client updates for Linux 6.9 2024-03-16 11:44:00 -07:00
nfs4xdr.c nfs: adapt to breakup of struct file_lock 2024-02-05 13:11:43 +01:00
nfs42.h NFSv4.2: fix listxattr maximum XDR buffer size 2024-02-28 16:18:18 -05:00
nfs42proc.c nfs42: client needs to strip file mode's suid/sgid bit after ALLOCATE op 2023-10-11 09:37:48 -04:00
nfs42xattr.c mm, slab: remove last vestiges of SLAB_MEM_SPREAD 2024-03-12 20:32:19 -07:00
nfs42xdr.c NFSv4.2: Rework scratch handling for READ_PLUS (again) 2023-08-23 15:58:47 -04:00
nfs.h nfs: move nfs4_xattr_handlers to .rodata 2023-10-09 16:24:20 +02:00
nfsroot.c NFS: Fix an off by one in root_nfs_cat() 2024-03-09 09:14:51 -05:00
nfstrace.c
nfstrace.h NFS: drop unused nfs_direct_req bytes_left 2024-01-04 10:47:56 -05:00
pagelist.c nfs: Avoid flushing many pages with NFS_FILE_SYNC 2024-05-24 12:26:14 -04:00
pnfs_dev.c NFSv4/pnfs: minor fix for cleanup path in nfs4_get_device_info 2023-08-24 13:24:15 -04:00
pnfs_nfs.c NFSv4.1/pnfs: fix NFS with TLS in pnfs 2024-03-09 09:14:51 -05:00
pnfs.c pNFS: rework pnfs_generic_pg_check_layout to check IO range 2024-05-21 08:34:15 -04:00
pnfs.h pNFS: rework pnfs_generic_pg_check_layout to check IO range 2024-05-21 08:34:15 -04:00
proc.c NFS: add atomic_open for NFSv3 to handle O_TRUNC correctly. 2024-05-20 11:09:20 -04:00
read.c NFS: Read unlock folio on nfs_page_create_from_folio() error 2024-03-09 09:14:51 -05:00
super.c NFS: make sure lock/nolock overriding local_lock mount option 2024-05-20 11:10:27 -04:00
symlink.c nfs: propagate readlink errors in nfs_symlink_filler 2024-05-22 19:25:00 -04:00
sysctl.c fs: Remove the now superfluous sentinel elements from ctl_table array 2023-12-28 04:57:57 -08:00
sysfs.c NFS: Fix sysfs server name memory leak 2023-08-19 10:26:29 -04:00
sysfs.h NFS: Add sysfs links to sunrpc clients for nfs_clients 2023-06-19 15:04:13 -04:00
unlink.c nfs: rename the nfs_async_rename_done tracepoint 2024-01-04 10:47:56 -05:00
write.c NFS client updates for Linux 6.9 2024-03-16 11:44:00 -07:00