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a01b8f2252
We dont need to allocate an ifs in ->write_begin() for writes where the position and length completely overlap with the given folio. Therefore, such cases are skipped. Currently when the folio is uptodate, we only allocate ifs at writeback time (in iomap_writepage_map()). This is ok until now, but when we are going to add support for per-block dirty state bitmap in ifs, this could cause some performance degradation. The reason is that if we don't allocate ifs during ->write_begin(), then we will never mark the necessary dirty bits in ->write_end() call. And we will have to mark all the bits as dirty at the writeback time, that could cause the same write amplification and performance problems as it is now. Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> |
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| .. | ||
| buffered-io.c | ||
| direct-io.c | ||
| fiemap.c | ||
| iter.c | ||
| Makefile | ||
| seek.c | ||
| swapfile.c | ||
| trace.c | ||
| trace.h | ||