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authorRaghavendra Gowdappa <rgowdapp@redhat.com>2019-01-29 08:05:07 +0530
committerAmar Tumballi <amarts@redhat.com>2019-02-02 03:07:35 +0000
commita229ee1c8cdf8e0ac1abaeb60cabe6ab08f60546 (patch)
tree3d9938817e442c1ababb803ca54aef420bd849e4 /xlators/mount/fuse
parent4674678951a1315975d66016fb55c49100b7819f (diff)
mount/fuse: expose auto-invalidation as a mount option
Auto invalidation is necessary when same (meta)data is shared/access across multiple mounts. However, if (meta)data is not shared, all relevant I/O goes through the cache of single mount and hence is coherent with (meta)data on bricks always. So, fuse-auto-invalidation can be disabled for this case which gives a huge performance boost for workloads that write data and then immediately read the data they just wrote. From glusterfs --help, <snip> --auto-invalidation[=BOOL] controls whether fuse-kernel can auto-invalidate attribute, dentry and page-cache. Disable this only if same files/directories are not accessed across two different mounts concurrently [default: "on"] </snip> Details on how disabling auto-invalidation helped to reduce pgbench init times can be found at [1]. Time taken for pgbench init of scale 8000 was 8340s. That will be an improvement of 86% (59280s vs 8340s) with auto-invalidations turned off along with other optimizations. Just disabling auto-invalidation contributed 56% improvement by reducing the total time taken by 33260s. [1] https://www.spinics.net/lists/gluster-devel/msg25907.html Change-Id: I0ed730dba9064bd9c576ad1800170a21e100e1ce Signed-off-by: Raghavendra Gowdappa <rgowdapp@redhat.com> updates: bz#1664934
Diffstat (limited to 'xlators/mount/fuse')
-rw-r--r--xlators/mount/fuse/src/fuse-bridge.c35
-rw-r--r--xlators/mount/fuse/src/fuse-bridge.h1
-rwxr-xr-xxlators/mount/fuse/utils/mount.glusterfs.in7
3 files changed, 33 insertions, 10 deletions
diff --git a/xlators/mount/fuse/src/fuse-bridge.c b/xlators/mount/fuse/src/fuse-bridge.c
index ff5831234b1..c3945d7a13c 100644
--- a/xlators/mount/fuse/src/fuse-bridge.c
+++ b/xlators/mount/fuse/src/fuse-bridge.c
@@ -5067,6 +5067,9 @@ fuse_init(xlator_t *this, fuse_in_header_t *finh, void *msg,
/* If user did not explicitly set --fopen-keep-cache[=off],
then check if kernel support FUSE_AUTO_INVAL_DATA and ...
*/
+
+ priv->fopen_keep_cache = 1;
+
#if FUSE_KERNEL_MINOR_VERSION >= 20
if (fini->flags & FUSE_AUTO_INVAL_DATA) {
/* ... enable fopen_keep_cache mode if supported.
@@ -5075,25 +5078,26 @@ fuse_init(xlator_t *this, fuse_in_header_t *finh, void *msg,
"Detected "
"support for FUSE_AUTO_INVAL_DATA. Enabling "
"fopen_keep_cache automatically.");
- fino.flags |= FUSE_AUTO_INVAL_DATA;
- priv->fopen_keep_cache = 1;
+
+ if (priv->fuse_auto_inval)
+ fino.flags |= FUSE_AUTO_INVAL_DATA;
} else
#endif
{
-
- gf_log("glusterfs-fuse", GF_LOG_DEBUG,
- "No support "
- "for FUSE_AUTO_INVAL_DATA. Disabling "
- "fopen_keep_cache.");
- /* ... else disable. */
- priv->fopen_keep_cache = 0;
+ if (priv->fuse_auto_inval) {
+ gf_log("glusterfs-fuse", GF_LOG_DEBUG,
+ "No support for FUSE_AUTO_INVAL_DATA. Disabling "
+ "fopen_keep_cache.");
+ /* ... else disable. */
+ priv->fopen_keep_cache = 0;
+ }
}
} else if (priv->fopen_keep_cache == 1) {
/* If user explicitly set --fopen-keep-cache[=on],
then enable FUSE_AUTO_INVAL_DATA if possible.
*/
#if FUSE_KERNEL_MINOR_VERSION >= 20
- if (fini->flags & FUSE_AUTO_INVAL_DATA) {
+ if (priv->fuse_auto_inval && (fini->flags & FUSE_AUTO_INVAL_DATA)) {
gf_log("glusterfs-fuse", GF_LOG_DEBUG,
"fopen_keep_cache "
"is explicitly set. Enabling FUSE_AUTO_INVAL_DATA");
@@ -6507,6 +6511,8 @@ init(xlator_t *this_xl)
GF_OPTION_INIT("reader-thread-count", priv->reader_thread_count, uint32,
cleanup_exit);
+ GF_OPTION_INIT("auto-invalidation", priv->fuse_auto_inval, bool,
+ cleanup_exit);
GF_OPTION_INIT(ZR_ENTRY_TIMEOUT_OPT, priv->entry_timeout, double,
cleanup_exit);
@@ -6944,6 +6950,15 @@ struct volume_options options[] = {
.description = "makes glusterfs invalidate kernel inodes after "
"reaching this limit (0 means 'unlimited')",
},
+ {
+ .key = {"auto-invalidation"},
+ .type = GF_OPTION_TYPE_BOOL,
+ .default_value = "true",
+ .description = "controls whether fuse-kernel can auto-invalidate "
+ "attribute, dentry and page-cache. Disable this only "
+ "if same files/directories are not accessed across "
+ "two different mounts concurrently",
+ },
{.key = {NULL}},
};
diff --git a/xlators/mount/fuse/src/fuse-bridge.h b/xlators/mount/fuse/src/fuse-bridge.h
index b892113eb79..697bd8848e1 100644
--- a/xlators/mount/fuse/src/fuse-bridge.h
+++ b/xlators/mount/fuse/src/fuse-bridge.h
@@ -187,6 +187,7 @@ struct fuse_private {
pthread_mutex_t interrupt_mutex;
gf_boolean_t flush_handle_interrupt;
+ gf_boolean_t fuse_auto_inval;
/* LRU Limit, if not set, default is 128k for now */
uint32_t lru_limit;
diff --git a/xlators/mount/fuse/utils/mount.glusterfs.in b/xlators/mount/fuse/utils/mount.glusterfs.in
index d09a7cd663e..868a57f7ede 100755
--- a/xlators/mount/fuse/utils/mount.glusterfs.in
+++ b/xlators/mount/fuse/utils/mount.glusterfs.in
@@ -229,6 +229,10 @@ start_glusterfs ()
cmd_line=$(echo "$cmd_line --reader-thread-count=$reader_thread_count");
fi
+ if [ -n "$auto-invalidation" ]; then
+ cmd_line=$(echo "$cmd_line --auto-invalidation=$fuse_auto_invalidation");
+ fi
+
if [ -n "$volume_name" ]; then
cmd_line=$(echo "$cmd_line --volume-name=$volume_name");
fi
@@ -529,6 +533,9 @@ with_options()
"reader-thread-count")
reader_thread_count=$value
;;
+ "auto-invalidation")
+ fuse_auto_invalidation=$value
+ ;;
"no-root-squash")
if [ $value = "yes" ] ||
[ $value = "on" ] ||