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fuse: fix request limit 

The size of struct fuse_req was reduced from 392B to 144B on a non-debug
config, thus the sanitize_global_limit() helper was setting a larger
default limit.  This doesn't really reflect reduction in the memory used by
requests, since the fields removed from fuse_req were added to fuse_args
derived structs; e.g. sizeof(struct fuse_writepages_args) is 248B, thus
resulting in slightly more memory being used for writepage requests
overalll (due to using 256B slabs).

Make the calculatation ignore the size of fuse_req and use the old 392B
value.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2019-09-12 14:28:13 +02:00
parent 05ea48cc2b
commit f22f812d5c
1 changed files with 5 additions and 2 deletions
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7
fs/fuse/inode.c
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@ -826,9 +826,12 @@ static const struct super_operations fuse_super_operations = {
static void sanitize_global_limit(unsigned *limit)
{
/*
* The default maximum number of async requests is calculated to consume
* 1/2^13 of the total memory, assuming 392 bytes per request.
*/
if (*limit == 0)
*limit = ((totalram_pages() << PAGE_SHIFT) >> 13) /
sizeof(struct fuse_req);
*limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392;
if (*limit >= 1 << 16)
*limit = (1 << 16) - 1;