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fs: nfs: inform the VM about pages being committed or unstable
VM page reclaim uses dirty and writeback page states to determine if flushers are cleaning pages too slowly and that page reclaim should stall waiting on flushers to catch up. Page state in NFS is a bit more complex and a clean page can be unreclaimable due to being unstable which is effectively "dirty" from the perspective of the VM from reclaim context. Similarly, if the inode is currently being committed then it's similar to being under writeback. This patch adds a is_dirty_writeback() handled for NFS that checks if a pages backing inode is being committed and should be accounted as writeback and if a page has private state indicating that it is effectively dirty. Signed-off-by: Mel Gorman <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Rik van Riel <[email protected]> Cc: KAMEZAWA Hiroyuki <[email protected]> Cc: Jiri Slaby <[email protected]> Cc: Valdis Kletnieks <[email protected]> Cc: Zlatko Calusic <[email protected]> Cc: dormando <[email protected]> Cc: Trond Myklebust <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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