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| author | Joanne Koong <joannelkoong@gmail.com> | 2024-09-23 10:13:11 -0700 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2024-10-25 17:05:49 +0200 |
| commit | 2b3933b1e0a0a4b758fbc164bb31db0c113a7e2c (patch) | |
| tree | 476333e1f6bfb488c3e04ec6eebd92875ffd3fb7 /Documentation/admin-guide/sysctl | |
| parent | fuse: remove stray debug line (diff) | |
| download | linux-2b3933b1e0a0a4b758fbc164bb31db0c113a7e2c.tar.gz linux-2b3933b1e0a0a4b758fbc164bb31db0c113a7e2c.zip | |
fuse: enable dynamic configuration of fuse max pages limit (FUSE_MAX_MAX_PAGES)
Introduce the capability to dynamically configure the max pages limit
(FUSE_MAX_MAX_PAGES) through a sysctl. This allows system administrators
to dynamically set the maximum number of pages that can be used for
servicing requests in fuse.
Previously, this is gated by FUSE_MAX_MAX_PAGES which is statically set
to 256 pages. One result of this is that the buffer size for a write
request is limited to 1 MiB on a 4k-page system.
The default value for this sysctl is the original limit (256 pages).
$ sysctl -a | grep max_pages_limit
fs.fuse.max_pages_limit = 256
$ sysctl -n fs.fuse.max_pages_limit
256
$ echo 1024 | sudo tee /proc/sys/fs/fuse/max_pages_limit
1024
$ sysctl -n fs.fuse.max_pages_limit
1024
$ echo 65536 | sudo tee /proc/sys/fs/fuse/max_pages_limit
tee: /proc/sys/fs/fuse/max_pages_limit: Invalid argument
$ echo 0 | sudo tee /proc/sys/fs/fuse/max_pages_limit
tee: /proc/sys/fs/fuse/max_pages_limit: Invalid argument
$ echo 65535 | sudo tee /proc/sys/fs/fuse/max_pages_limit
65535
$ sysctl -n fs.fuse.max_pages_limit
65535
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'Documentation/admin-guide/sysctl')
| -rw-r--r-- | Documentation/admin-guide/sysctl/fs.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/admin-guide/sysctl/fs.rst b/Documentation/admin-guide/sysctl/fs.rst index 47499a1742bd..fa25d7e718b3 100644 --- a/Documentation/admin-guide/sysctl/fs.rst +++ b/Documentation/admin-guide/sysctl/fs.rst @@ -332,3 +332,13 @@ Each "watch" costs roughly 90 bytes on a 32-bit kernel, and roughly 160 bytes on a 64-bit one. The current default value for ``max_user_watches`` is 4% of the available low memory, divided by the "watch" cost in bytes. + +5. /proc/sys/fs/fuse - Configuration options for FUSE filesystems +===================================================================== + +This directory contains the following configuration options for FUSE +filesystems: + +``/proc/sys/fs/fuse/max_pages_limit`` is a read/write file for +setting/getting the maximum number of pages that can be used for servicing +requests in FUSE. |