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authorMiklos Szeredi <mszeredi@redhat.com>2018-10-01 11:07:06 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2018-10-01 11:07:06 +0300
commite52a8250480acd3b26534793c61816e30d85fbb6 (patch)
treebe2ae4d947e7fb876eae27926f70cf9c702243b2 /include/linux/bitops.h
parent5da784cce4308ae10a79e3c8c41b13fb9568e4e0 (diff)
downloadlinux-e52a8250480acd3b26534793c61816e30d85fbb6.tar.xz
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 'include/linux/bitops.h')
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