kernel_optimize_test/include
Dai Ngo 227823d207 nfs: optimise readdir cache page invalidation
When the directory is large and it's being modified by one client
while another client is doing the 'ls -l' on the same directory then
the cache page invalidation from nfs_force_use_readdirplus causes
the reading client to keep restarting READDIRPLUS from cookie 0
which causes the 'ls -l' to take a very long time to complete,
possibly never completing.

Currently when nfs_force_use_readdirplus is called to switch from
READDIR to READDIRPLUS, it invalidates all the cached pages of the
directory. This cache page invalidation causes the next nfs_readdir
to re-read the directory content from cookie 0.

This patch is to optimise the cache invalidation in
nfs_force_use_readdirplus by only truncating the cached pages from
last page index accessed to the end the file. It also marks the
inode to delay invalidating all the cached page of the directory
until the next initial nfs_readdir of the next 'ls' instance.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Reviewed-by: Trond Myklebust <trond.myklebust@hammerspace.com>
[Anna - Fix conflicts with Trond's readdir patches]
[Anna - Remove redundant call to nfs_zap_mapping()]
[Anna - Replace d_inode(file_dentry(desc->file)) with file_inode(desc->file)]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-04 10:50:44 -05:00
..
acpi
asm-generic asm-generic/nds32: don't redefine cacheflush primitives 2019-12-30 11:18:43 +01:00
clocksource
crypto
drm
dt-bindings
keys
kunit
kvm
linux nfs: optimise readdir cache page invalidation 2020-02-04 10:50:44 -05:00
math-emu
media
misc
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2020-01-08 15:22:41 -08:00
pcmcia
ras
rdma
scsi
soc riscv: move sifive_l2_cache.h to include/soc 2020-01-12 10:12:44 -08:00
sound
target
trace xprtrdma: Make sendctx queue lifetime the same as connection lifetime 2020-01-15 10:54:32 -05:00
uapi Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2020-01-09 15:37:40 -08:00
vdso
video
xen