user/sven/linux.git/include/trace/events, branch v5.16

mm: vmscan: Reduce throttling due to a failure to make progress

2021-12-31T19:17:07Z

Mike Galbraith, Alexey Avramov and Darrick Wong all reported similar problems due to reclaim throttling for excessive lengths of time. In Alexey's case, a memory hog that should go OOM quickly stalls for several minutes before stalling. In Mike and Darrick's cases, a small memcg environment stalled excessively even though the system had enough memory overall. Commit 69392a403f49 ("mm/vmscan: throttle reclaim when no progress is being made") introduced the problem although commit a19594ca4a8b ("mm/vmscan: increase the timeout if page reclaim is not making progress") made it worse. Systems at or near an OOM state that cannot be recovered must reach OOM quickly and memcg should kill tasks if a memcg is near OOM. To address this, only stall for the first zone in the zonelist, reduce the timeout to 1 tick for VMSCAN_THROTTLE_NOPROGRESS and only stall if the scan control nr_reclaimed is 0, kswapd is still active and there were excessive pages pending for writeback. If kswapd has stopped reclaiming due to excessive failures, do not stall at all so that OOM triggers relatively quickly. Similarly, if an LRU is simply congested, only lightly throttle similar to NOPROGRESS. Alexey's original case was the most straight forward for i in {1..3}; do tail /dev/zero; done On vanilla 5.16-rc1, this test stalled heavily, after the patch the test completes in a few seconds similar to 5.15. Alexey's second test case added watching a youtube video while tail runs 10 times. On 5.15, playback only jitters slightly, 5.16-rc1 stalls a lot with lots of frames missing and numerous audio glitches. With this patch applies, the video plays similarly to 5.15. [lkp@intel.com: Fix W=1 build warning] Link: https://lore.kernel.org/r/99e779783d6c7fce96448a3402061b9dc1b3b602.camel@gmx.de Link: https://lore.kernel.org/r/20211124011954.7cab9bb4@mail.inbox.lv Link: https://lore.kernel.org/r/20211022144651.19914-1-mgorman@techsingularity.net Link: https://lore.kernel.org/r/20211202150614.22440-1-mgorman@techsingularity.net Link: https://linux-regtracking.leemhuis.info/regzbot/regression/20211124011954.7cab9bb4@mail.inbox.lv/ Reported-and-tested-by: Alexey Avramov Reported-and-tested-by: Mike Galbraith Reported-and-tested-by: Darrick J. Wong Reported-by: kernel test robot Acked-by: Hugh Dickins Tracked-by: Thorsten Leemhuis Fixes: 69392a403f49 ("mm/vmscan: throttle reclaim when no progress is being made") Signed-off-by: Mel Gorman Signed-off-by: Linus Torvalds

Merge tag 'nfs-for-5.16-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

2021-11-27T18:33:55Z

Pull NFS client fixes from Trond Myklebust: "Highlights include: Stable fixes: - NFSv42: Fix pagecache invalidation after COPY/CLONE Bugfixes: - NFSv42: Don't fail clone() just because the server failed to return post-op attributes - SUNRPC: use different lockdep keys for INET6 and LOCAL - NFSv4.1: handle NFS4ERR_NOSPC from CREATE_SESSION - SUNRPC: fix header include guard in trace header" * tag 'nfs-for-5.16-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: SUNRPC: use different lock keys for INET6 and LOCAL sunrpc: fix header include guard in trace header NFSv4.1: handle NFS4ERR_NOSPC by CREATE_SESSION NFSv42: Fix pagecache invalidation after COPY/CLONE NFS: Add a tracepoint to show the results of nfs_set_cache_invalid() NFSv42: Don't fail clone() unless the OP_CLONE operation failed

sunrpc: fix header include guard in trace header

2021-11-17T23:27:32Z

rpcgss.h include protection was protecting against the define for rpcrdma.h. Signed-off-by: Thiago Rafael Becker Signed-off-by: Trond Myklebust

Merge tag 'f2fs-for-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

2021-11-13T19:20:22Z

Pull f2fs updates from Jaegeuk Kim: "In this cycle, we've applied relatively small number of patches which fix subtle corner cases mainly, while introducing a new mount option to be able to fragment the disk intentionally for performance tests. Enhancements: - add a mount option to fragmente on-disk layout to understand the performance - support direct IO for multi-partitions - add a fault injection of dquot_initialize Bug fixes: - address some lockdep complaints - fix a deadlock issue with quota - fix a memory tuning condition - fix compression condition to improve the ratio - fix disabling compression on the non-empty compressed file - invalidate cached pages before IPU/DIO writes And, we've added some minor clean-ups as usual" * tag 'f2fs-for-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: f2fs: fix UAF in f2fs_available_free_memory f2fs: invalidate META_MAPPING before IPU/DIO write f2fs: support fault injection for dquot_initialize() f2fs: fix incorrect return value in f2fs_sanity_check_ckpt() f2fs: compress: disallow disabling compress on non-empty compressed file f2fs: compress: fix overwrite may reduce compress ratio unproperly f2fs: multidevice: support direct IO f2fs: introduce fragment allocation mode mount option f2fs: replace snprintf in show functions with sysfs_emit f2fs: include non-compressed blocks in compr_written_block f2fs: fix wrong condition to trigger background checkpoint correctly f2fs: fix to use WHINT_MODE f2fs: fix up f2fs_lookup tracepoints f2fs: set SBI_NEED_FSCK flag when inconsistent node block found f2fs: introduce excess_dirty_threshold() f2fs: avoid attaching SB_ACTIVE flag during mount f2fs: quota: fix potential deadlock f2fs: should use GFP_NOFS for directory inodes

Merge tag 'netfs-folio-20211111' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

2021-11-13T19:15:15Z

Pull netfs, 9p, afs and ceph (partial) foliation from David Howells: "This converts netfslib, 9p and afs to use folios. It also partially converts ceph so that it uses folios on the boundaries with netfslib. To help with this, a couple of folio helper functions are added in the first two patches. These patches don't touch fscache and cachefiles as I intend to remove all the code that deals with pages directly from there. Only nfs and cifs are using the old fscache I/O API now. The new API uses iov_iter instead. Thanks to Jeff Layton, Dominique Martinet and AuriStor for testing and retesting the patches" * tag 'netfs-folio-20211111' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: afs: Use folios in directory handling netfs, 9p, afs, ceph: Use folios folio: Add a function to get the host inode for a folio folio: Add a function to change the private data attached to a folio

Merge tag 'nfsd-5.16' of git://linux-nfs.org/~bfields/linux

2021-11-11T00:45:54Z

Pull nfsd updates from Bruce Fields: "A slow cycle for nfsd: mainly cleanup, including Neil's patch dropping support for a filehandle format deprecated 20 years ago, and further xdr-related cleanup from Chuck" * tag 'nfsd-5.16' of git://linux-nfs.org/~bfields/linux: (26 commits) nfsd4: remove obselete comment nfsd: document server-to-server-copy parameters NFSD:fix boolreturn.cocci warning nfsd: update create verifier comment SUNRPC: Change return value type of .pc_encode SUNRPC: Replace the "__be32 *p" parameter to .pc_encode NFSD: Save location of NFSv4 COMPOUND status SUNRPC: Change return value type of .pc_decode SUNRPC: Replace the "__be32 *p" parameter to .pc_decode SUNRPC: De-duplicate .pc_release() call sites SUNRPC: Simplify the SVC dispatch code path SUNRPC: Capture value of xdr_buf::page_base SUNRPC: Add trace event when alloc_pages_bulk() makes no progress svcrdma: Split svcrmda_wc_{read,write} tracepoints svcrdma: Split the svcrdma_wc_send() tracepoint svcrdma: Split the svcrdma_wc_receive() tracepoint NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment() SUNRPC: xdr_stream_subsegment() must handle non-zero page_bases NFSD: Initialize pointer ni with NULL and not plain integer 0 NFSD: simplify struct nfsfh ...

Merge tag 'nfs-for-5.16-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

2021-11-11T00:32:46Z

Pull NFS client updates from Trond Myklebust: "Highlights include: Features: - NFSv4.1 can always retrieve and cache the ACCESS mode on OPEN - Optimisations for READDIR and the 'ls -l' style workload - Further replacements of dprintk() with tracepoints and other tracing improvements - Ensure we re-probe NFSv4 server capabilities when the user does a "mount -o remount" Bugfixes: - Fix an Oops in pnfs_mark_request_commit() - Fix up deadlocks in the commit code - Fix regressions in NFSv2/v3 attribute revalidation due to the change_attr_type optimisations - Fix some dentry verifier races - Fix some missing dentry verifier settings - Fix a performance regression in nfs_set_open_stateid_locked() - SUNRPC was sending multiple SYN calls when re-establishing a TCP connection. - Fix multiple NFSv4 issues due to missing sanity checking of server return values - Fix a potential Oops when FREE_STATEID races with an unmount Cleanups: - Clean up the labelled NFS code - Remove unused header " * tag 'nfs-for-5.16-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (84 commits) NFSv4: Sanity check the parameters in nfs41_update_target_slotid() NFS: Remove the nfs4_label argument from decode_getattr_*() functions NFS: Remove the nfs4_label argument from nfs_setsecurity NFS: Remove the nfs4_label argument from nfs_fhget() NFS: Remove the nfs4_label argument from nfs_add_or_obtain() NFS: Remove the nfs4_label argument from nfs_instantiate() NFS: Remove the nfs4_label from the nfs_setattrres NFS: Remove the nfs4_label from the nfs4_getattr_res NFS: Remove the f_label from the nfs4_opendata and nfs_openres NFS: Remove the nfs4_label from the nfs4_lookupp_res struct NFS: Remove the label from the nfs4_lookup_res struct NFS: Remove the nfs4_label from the nfs4_link_res struct NFS: Remove the nfs4_label from the nfs4_create_res struct NFS: Remove the nfs4_label from the nfs_entry struct NFS: Create a new nfs_alloc_fattr_with_label() function NFS: Always initialise fattr->label in nfs_fattr_alloc() NFSv4.2: alloc_file_pseudo() takes an open flag, not an f_mode NFS: Don't allocate nfs_fattr on the stack in __nfs42_ssc_open() NFSv4: Remove unnecessary 'minor version' check NFSv4: Fix potential Oops in decode_op_map() ...

netfs, 9p, afs, ceph: Use folios

2021-11-10T21:16:56Z

Convert the netfs helper library to use folios throughout, convert the 9p and afs filesystems to use folios in their file I/O paths and convert the ceph filesystem to use just enough folios to compile. With these changes, afs passes -g quick xfstests. Changes ======= ver #5: - Got rid of folio_end{io,_read,_write}() and inlined the stuff it does instead (Willy decided he didn't want this after all). ver #4: - Fixed a bug in afs_redirty_page() whereby it didn't set the next page index in the loop and returned too early. - Simplified a check in v9fs_vfs_write_folio_locked()[1]. - Undid a change to afs_symlink_readpage()[1]. - Used offset_in_folio() in afs_write_end()[1]. - Changed from using page_endio() to folio_end{io,_read,_write}()[1]. ver #2: - Add 9p foliation. Signed-off-by: David Howells Reviewed-by: Jeff Layton Tested-by: Jeff Layton Tested-by: Dominique Martinet Tested-by: kafs-testing@auristor.com cc: Matthew Wilcox (Oracle) cc: Marc Dionne cc: Ilya Dryomov cc: Dominique Martinet cc: v9fs-developer@lists.sourceforge.net cc: linux-afs@lists.infradead.org cc: ceph-devel@vger.kernel.org cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/YYKa3bfQZxK5/wDN@casper.infradead.org/ [1] Link: https://lore.kernel.org/r/2408234.1628687271@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/162877311459.3085614.10601478228012245108.stgit@warthog.procyon.org.uk/ Link: https://lore.kernel.org/r/162981153551.1901565.3124454657133703341.stgit@warthog.procyon.org.uk/ Link: https://lore.kernel.org/r/163005745264.2472992.9852048135392188995.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163584187452.4023316.500389675405550116.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/163649328026.309189.1124218109373941936.stgit@warthog.procyon.org.uk/ # v4 Link: https://lore.kernel.org/r/163657852454.834781.9265101983152100556.stgit@warthog.procyon.org.uk/ # v5

Merge branch 'akpm' (patches from Andrew)

2021-11-06T21:08:17Z

Merge misc updates from Andrew Morton: "257 patches. Subsystems affected by this patch series: scripts, ocfs2, vfs, and mm (slab-generic, slab, slub, kconfig, dax, kasan, debug, pagecache, gup, swap, memcg, pagemap, mprotect, mremap, iomap, tracing, vmalloc, pagealloc, memory-failure, hugetlb, userfaultfd, vmscan, tools, memblock, oom-kill, hugetlbfs, migration, thp, readahead, nommu, ksm, vmstat, madvise, memory-hotplug, rmap, zsmalloc, highmem, zram, cleanups, kfence, and damon)" * emailed patches from Andrew Morton : (257 commits) mm/damon: remove return value from before_terminate callback mm/damon: fix a few spelling mistakes in comments and a pr_debug message mm/damon: simplify stop mechanism Docs/admin-guide/mm/pagemap: wordsmith page flags descriptions Docs/admin-guide/mm/damon/start: simplify the content Docs/admin-guide/mm/damon/start: fix a wrong link Docs/admin-guide/mm/damon/start: fix wrong example commands mm/damon/dbgfs: add adaptive_targets list check before enable monitor_on mm/damon: remove unnecessary variable initialization Documentation/admin-guide/mm/damon: add a document for DAMON_RECLAIM mm/damon: introduce DAMON-based Reclamation (DAMON_RECLAIM) selftests/damon: support watermarks mm/damon/dbgfs: support watermarks mm/damon/schemes: activate schemes based on a watermarks mechanism tools/selftests/damon: update for regions prioritization of schemes mm/damon/dbgfs: support prioritization weights mm/damon/vaddr,paddr: support pageout prioritization mm/damon/schemes: prioritize regions within the quotas mm/damon/selftests: support schemes quotas mm/damon/dbgfs: support quotas of schemes ...

mm/vmscan: throttle reclaim when no progress is being made

2021-11-06T20:30:40Z

Memcg reclaim throttles on congestion if no reclaim progress is made. This makes little sense, it might be due to writeback or a host of other factors. For !memcg reclaim, it's messy. Direct reclaim primarily is throttled in the page allocator if it is failing to make progress. Kswapd throttles if too many pages are under writeback and marked for immediate reclaim. This patch explicitly throttles if reclaim is failing to make progress. [vbabka@suse.cz: Remove redundant code] Link: https://lkml.kernel.org/r/20211022144651.19914-4-mgorman@techsingularity.net Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka Cc: Andreas Dilger Cc: "Darrick J . Wong" Cc: Dave Chinner Cc: Johannes Weiner Cc: Jonathan Corbet Cc: Matthew Wilcox Cc: Michal Hocko Cc: NeilBrown Cc: Rik van Riel Cc: "Theodore Ts'o" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds