Make balance_dirty_pages start the throttling when the WRITEBACK_TEMP counter is high enough. This prevents us from having too many dirty pages on fuse, thus giving the userspace part of it a chance to write stuff properly.
Note, that the existing balance logic is per-bdi, i.e. if the fuse user task gets stuck in the function this means, that it either writes to the mountpoint it serves (but it can deadlock even without the writeback) or it is writing to some _other_ dirty bdi and in the latter case someone else will free the memory for it. Signed-off-by: Maxim Patlasov <[email protected]> Signed-off-by: Pavel Emelyanov <[email protected]> --- mm/page-writeback.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 0713bfb..c47bcd4 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1235,7 +1235,8 @@ static void balance_dirty_pages(struct address_space *mapping, */ nr_reclaimable = global_page_state(NR_FILE_DIRTY) + global_page_state(NR_UNSTABLE_NFS); - nr_dirty = nr_reclaimable + global_page_state(NR_WRITEBACK); + nr_dirty = nr_reclaimable + global_page_state(NR_WRITEBACK) + + global_page_state(NR_WRITEBACK_TEMP); global_dirty_limits(&background_thresh, &dirty_thresh); _______________________________________________ Devel mailing list [email protected] https://lists.openvz.org/mailman/listinfo/devel
