Hello, Wondering if anyone has a suggestion for when xfs_iomap_write_unwritten gets into congestion_wait. In this case the system has almost half of normal zone pages in NR_WRITEBACK with pretty much everybody held up in either congestion_wait or balance_dirty_pages. Since there are some free pages, seems like we'd be better off just using a little more memory to finish this IO and in turn reduce pages under write-back and add to free memory, rather than holding up here. So maybe PF_MEMALLOC? It also looks like this path allocates log vectors with KM_SLEEP but lv_buf's with KM_SLEEP|KM_NOFS. Why is that? PID: 7011 TASK: ffff880226282040 CPU: 2 COMMAND: "xfsconvertd/2" #0 [ffff88022629b550] schedule at ffffffff814f5862 #1 [ffff88022629b618] schedule_timeout at ffffffff814f66a2 #2 [ffff88022629b6c8] io_schedule_timeout at ffffffff814f532f #3 [ffff88022629b6f8] congestion_wait at ffffffff81137450 #4 [ffff88022629b758] throttle_vm_writeout at ffffffff81128c78 #5 [ffff88022629b798] shrink_zone at ffffffff8112ea3b #6 [ffff88022629b848] do_try_to_free_pages at ffffffff8112ecfe #7 [ffff88022629b8d8] try_to_free_pages at ffffffff8112f30d #8 [ffff88022629b988] __alloc_pages_nodemask at ffffffff81126797 #9 [ffff88022629ba98] kmem_getpages at ffffffff8115db12 #10 [ffff88022629bac8] fallback_alloc at ffffffff8115e72a #11 [ffff88022629bb48] ____cache_alloc_node at ffffffff8115e4a9 #12 [ffff88022629bba8] __kmalloc at ffffffff8115f0d9 #13 [ffff88022629bbf8] kmem_alloc at ffffffffa02d69f7 #14 [ffff88022629bc38] xfs_log_commit_cil at ffffffffa02c3ebd #15 [ffff88022629bcb8] _xfs_trans_commit at ffffffffa02cfe99 #16 [ffff88022629bd18] xfs_iomap_write_unwritten at ffffffffa02bce01 #17 [ffff88022629be18] xfs_end_io at ffffffffa02d72bb #18 [ffff88022629be38] worker_thread at ffffffff8108c6a0 #19 [ffff88022629bee8] kthread at ffffffff81091ca6 #20 [ffff88022629bf48] kernel_thread at ffffffff8100c14a Apologies in advance, this is an older kernel (2.6.32-279) but has many more recent patches (thank-you!) -Peter _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
