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linux/include/trace/events
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NeilBrown 8d92890bd6 mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead 
After an NFS page has been written it is considered "unstable" until a
COMMIT request succeeds.  If the COMMIT fails, the page will be
re-written.

These "unstable" pages are currently accounted as "reclaimable", either
in WB_RECLAIMABLE, or in NR_UNSTABLE_NFS which is included in a
'reclaimable' count.  This might have made sense when sending the COMMIT
required a separate action by the VFS/MM (e.g.  releasepage() used to
send a COMMIT).  However now that all writes generated by ->writepages()
will automatically be followed by a COMMIT (since commit 919e3bd9a8
("NFS: Ensure we commit after writeback is complete")) it makes more
sense to treat them as writeback pages.

So this patch removes NR_UNSTABLE_NFS and accounts unstable pages in
NR_WRITEBACK and WB_WRITEBACK.

A particular effect of this change is that when
wb_check_background_flush() calls wb_over_bg_threshold(), the latter
will report 'true' a lot less often as the 'unstable' pages are no
longer considered 'dirty' (as there is nothing that writeback can do
about them anyway).

Currently wb_check_background_flush() will trigger writeback to NFS even
when there are relatively few dirty pages (if there are lots of unstable
pages), this can result in small writes going to the server (10s of
Kilobytes rather than a Megabyte) which hurts throughput.  With this
patch, there are fewer writes which are each larger on average.

Where the NR_UNSTABLE_NFS count was included in statistics
virtual-files, the entry is retained, but the value is hard-coded as
zero.  static trace points and warning printks which mentioned this
counter no longer report it.

[akpm@linux-foundation.org: re-layout comment]
[akpm@linux-foundation.org: fix printk warning]
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Acked-by: Michal Hocko <mhocko@suse.com>	[mm]
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Link: http://lkml.kernel.org/r/87d06j7gqa.fsf@notabene.neil.brown.name
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2020-06-02 10:59:08 -07:00
..
9p.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
afs.h afs: Fix some tracing details 2020-03-13 23:04:34 +00:00
alarmtimer.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
asoc.h ASoC: trace: remove snd_soc_codec 2018-04-16 11:53:35 +01:00
bcache.h bcache: print written and keys in trace_bcache_btree_write 2020-01-23 11:40:02 -07:00
block.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bpf_test_run.h selftests: bpf: test writable buffers in raw tps 2019-04-26 19:04:19 -07:00
bridge.h net: bridge: fdb: br_fdb_update can take flags directly 2019-11-01 10:32:43 -07:00
btrfs.h btrfs: switch to per-transaction pinned extents 2020-03-23 17:01:38 +01:00
cachefiles.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
cgroup.h cgroup: use cgrp->kn->id as the cgroup ID 2019-11-12 08:18:04 -08:00
clk.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
cma.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compaction.h mm, compaction: some tracepoints should be defined only when CONFIG_COMPACTION is set 2019-05-14 09:47:46 -07:00
context_tracking.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpuhp.h treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively 2019-04-09 14:19:06 +02:00
devfreq.h trace: events: add devfreq trace event file 2019-04-16 09:29:18 +09:00
devlink.h devlink: Add support for direct reporter health state update 2019-03-04 11:00:43 -08:00
dma_fence.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
erofs.h erofs: convert uncompressed files from readpages to readahead 2020-06-02 10:59:07 -07:00
ext4.h ext4: fix extent_status trace points 2020-01-25 02:03:03 -05:00
f2fs.h f2fs: convert from readpages to readahead 2020-06-02 10:59:07 -07:00
fib.h net: Replace nhc_has_gw with nhc_gw_family 2019-04-08 15:22:40 -07:00
fib6.h ipv6: Add fib6_type and fib6_flags to fib6_result 2019-04-17 23:11:30 -07:00
filelock.h locks: revise generic_add_lease tracepoint 2019-07-22 06:54:41 -04:00
filemap.h ftrace: Rework event_create_dir() 2019-11-27 07:44:25 +01:00
fs_dax.h libnvdimm for 4.15 2017-11-17 09:51:57 -08:00
fscache.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
fsi.h trace: fsi: Print transfer size unsigned 2019-11-08 11:23:37 +01:00
fsi_master_aspeed.h fsi: aspeed: Add trace points 2019-11-08 11:28:20 +01:00
fsi_master_ast_cf.h fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire 2018-07-23 15:22:52 +10:00
fsi_master_gpio.h fsi: master-gpio: Add more tracepoints 2018-07-12 12:02:31 +10:00
gpio.h tracing: stop making gpio tracing configurable 2019-04-08 15:11:48 +02:00
gpu_mem.h gpu/trace: Minor comment updates for gpu_mem_total tracepoint 2020-05-07 13:32:57 -04:00
host1x.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
hswadsp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
huge_memory.h khugepaged: skip collapse if uffd-wp detected 2020-04-07 10:43:39 -07:00
hwmon.h hwmon: (core) Add trace events to _attr_show/store functions 2018-10-11 20:07:35 -07:00
i2c.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
ib_mad.h IB/MAD: Add SMP details to MAD tracing 2019-03-27 15:52:01 -03:00
ib_umad.h IB/UMAD: Add umad trace points 2019-03-27 15:52:01 -03:00
initcall.h tracing: initcall: Ordered comparison of function pointers 2018-04-26 15:02:46 -04:00
intel-sst.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
intel_iommu.h iommu/vt-d: trace: Extend map_sg trace event 2020-01-07 14:05:57 +01:00
intel_ish.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
io_uring.h io_uring: use poll driven retry for files that support it 2020-03-02 14:06:38 -07:00
iocost.h blk-iocost: Fix error on iocost_ioc_vrate_adj 2020-04-21 09:49:36 -06:00
iommu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ipi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq_matrix.h genirq/matrix: Add tracepoints 2017-09-25 20:38:26 +02:00
iscsi.h scsi: iscsi: Capture iscsi debug messages using tracepoints 2018-12-20 20:03:55 -05:00
jbd2.h jbd2: Provide trace event for handle restarts 2019-11-05 16:00:49 -05:00
kmem.h mm, tracing: print symbol name for kmem_alloc_node call_site events 2020-01-31 10:30:38 -08:00
kvm.h KVM: Fix stack-out-of-bounds read in write_mmio 2017-12-18 12:57:01 +01:00
kyber.h kyber: fix wrong strlcpy() size in trace_kyber_latency() 2018-11-12 08:28:37 -07:00
libata.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
lock.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mce.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mdio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
migrate.h mm, sched/numa: Remove rate-limiting of automatic NUMA balancing migration 2018-10-02 11:31:14 +02:00
mlxsw.h mlxsw: spectrum_acl: Rename rehash_dis trace 2019-03-31 11:01:23 -07:00
mmap.h mm: mmap: add trace point of vm_unmapped_area 2020-04-02 09:35:30 -07:00
mmc.h mmc: core: Fix tracepoint print of blk_addr and blksz 2018-03-15 11:15:22 +01:00
mmflags.h mm/vma: add missing VMA flag readable name for VM_SYNC 2020-04-07 10:43:37 -07:00
module.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
napi.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
nbd.h nbd: add tracepoints for send/receive timing 2019-04-26 19:04:19 -07:00
neigh.h neighbor: Add tracepoint to __neigh_create 2019-05-22 17:50:24 -07:00
net.h net: add a generic tracepoint for TX queue timeout 2019-05-04 00:41:41 -04:00
net_probe_common.h net: dccp: Add DCCP sendmsg trace event 2018-01-02 14:27:30 -05:00
nilfs2.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nmi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
objagg.h lib: introduce initial implementation of object aggregation manager 2018-11-15 14:43:43 -08:00
oom.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page_isolation.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page_pool.h page_pool: Add API to update numa node 2019-11-20 11:47:36 -08:00
page_ref.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pagemap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
percpu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
power.h PM: QoS: Simplify definitions of CPU latency QoS trace events 2020-02-13 11:26:39 +01:00
power_cpu_migrate.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
preemptirq.h tracing: Change offset type to s32 in preempt/irq tracepoints 2020-01-03 11:34:37 -05:00
printk.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pwc.h media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc_handler() 2019-01-16 11:15:11 -05:00
pwm.h pwm: Implement tracing for .get_state() and .apply_state() 2020-01-20 12:28:37 +01:00
qdisc.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
qla.h scsi: qla2xxx: add ring buffer for tracing debug logs 2020-03-11 23:07:57 -04:00
random.h random: only read from /dev/random after its pool has received 128 bits 2019-04-17 10:30:21 -04:00
rcu.h Merge branches 'doc.2020.02.27a', 'fixes.2020.03.21a', 'kfree_rcu.2020.02.20a', 'locktorture.2020.02.20a', 'ovld.2020.02.20a', 'rcu-tasks.2020.02.20a', 'srcu.2020.02.20a' and 'torture.2020.02.20a' into HEAD 2020-03-21 17:15:11 -07:00
rdma.h rdma/ib: Add trace point macros to display human-readable values 2018-01-23 09:44:14 -05:00
rdma_core.h RDMA/core: Add trace points to follow MR allocation 2020-01-07 16:10:53 -04:00
regulator.h regulator: core: Add regulator bypass trace points 2020-05-29 17:17:02 +01:00
rpcgss.h SUNRPC: Clean up: Replace dprintk and BUG_ON call sites in svcauth_gss.c 2020-03-16 12:04:31 -04:00
rpcrdma.h NFS client bugfixes for Linux 5.7 2020-05-02 11:24:01 -07:00
rpm.h PM-runtime: add tracepoints for usage_count changes 2020-01-13 12:28:29 +01:00
rseq.h rseq: Introduce restartable sequences system call 2018-06-06 11:58:31 +02:00
rtc.h rtc: Add tracepoints for RTC system 2018-02-13 21:30:22 +01:00
rxrpc.h rxrpc: Trace discarded ACKs 2020-05-20 15:33:41 +01:00
sched.h sched/pelt: Add support to track thermal pressure 2020-03-06 12:57:17 +01:00
scmi.h include: trace: Add SCMI header with trace events 2019-12-30 12:34:29 +00:00
scsi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sctp.h sctp: move trace_sctp_probe_path into sctp_outq_sack 2019-12-26 13:06:45 -08:00
signal.h signal: Distinguish between kernel_siginfo and siginfo 2018-10-03 16:47:43 +02:00
siox.h siox: add support for tracing 2017-12-19 10:56:24 +01:00
skb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smbus.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
sock.h tcp: Define IPPROTO_MPTCP 2020-01-09 18:41:41 -08:00
spi.h spi/trace: Cap buffer contents at 64 bytes 2019-05-02 10:37:52 +09:00
spmi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sunrpc.h sunrpc: Add tracing for cache events 2020-03-16 12:04:34 -04:00
sunvnet.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
swiotlb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscalls.h syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
target.h scsi: target: core: add task tag to trace events 2020-03-26 21:56:04 -04:00
task.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tcp.h tcp: remove redundant new line from tcp_event_sk_skb 2019-11-09 19:41:50 -08:00
tegra_apb_dma.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
thermal.h cpu_cooling: Drop static-power related stuff 2017-12-07 22:52:01 +01:00
thermal_power_allocator.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
thp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
timer.h y2038: syscall implementation cleanups 2019-12-01 14:00:59 -08:00
tlb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ufs.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
v4l2.h media: v4l2: abstract timeval handling in v4l2_buffer 2020-01-03 15:43:35 +01:00
vb2.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmscan.h mm: code cleanup for MADV_FREE 2020-04-07 10:43:38 -07:00
vsock_virtio_transport_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wbt.h bdi: use bdi_dev_name() to get device name 2020-05-09 16:07:39 -06:00
workqueue.h workqueue: remove workqueue_work event class 2020-01-15 08:02:59 -08:00
writeback.h mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead 2020-06-02 10:59:08 -07:00
xdp.h devmap: Adjust tracepoint for map-less queue flush 2020-01-16 20:03:34 -08:00
xen.h tracing: xen: Ordered comparison of function pointers 2020-01-14 15:55:57 -05:00