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| author | Miklos Szeredi <mszeredi@redhat.com> | 2018-10-01 10:07:06 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-10-01 10:07:06 +0200 |
| commit | e52a8250480acd3b26534793c61816e30d85fbb6 (patch) | |
| tree | be2ae4d947e7fb876eae27926f70cf9c702243b2 /fs/fuse/fuse_i.h | |
| parent | 5da784cce4308ae10a79e3c8c41b13fb9568e4e0 (diff) | |
| download | lwn-e52a8250480acd3b26534793c61816e30d85fbb6.tar.gz lwn-e52a8250480acd3b26534793c61816e30d85fbb6.zip | |
fuse: realloc page array
Writeback caching currently allocates requests with the maximum number of
possible pages, while the actual number of pages per request depends on a
couple of factors that cannot be determined when the request is allocated
(whether page is already under writeback, whether page is contiguous with
previous pages already added to a request).
This patch allows such requests to start with no page allocation (all pages
inline) and grow the page array on demand.
If the max_pages tunable remains the default value, then this will mean
just one allocation that is the same size as before. If the tunable is
larger, then this adds at most 3 additional memory allocations (which is
generously compensated by the improved performance from the larger
request).
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/fuse_i.h')
| -rw-r--r-- | fs/fuse/fuse_i.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 3d578745c852..b7d96e7b5e0f 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -879,6 +879,10 @@ struct fuse_req *fuse_request_alloc(unsigned npages); struct fuse_req *fuse_request_alloc_nofs(unsigned npages); +bool fuse_req_realloc_pages(struct fuse_conn *fc, struct fuse_req *req, + gfp_t flags); + + /** * Free a request */ |