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e52a825048
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>
2365 lines
54 KiB
2365 lines
54 KiB