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4fe6a94682
mirror_ubuntu-kernels/include/trace/events
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David Howells 4fe6a94682 afs: Try to avoid taking RCU read lock when checking vnode validity 
Try to avoid taking the RCU read lock when checking the validity of a
vnode's callback state.  The only thing it's needed for is to pin the
parent volume's server list whilst we search it to find the record of the
server we're currently using to see if it has been reinitialised (ie. it
sent us a CB.InitCallBackState* RPC).

Do this by the following means:

 (1) Keep an additional per-cell counter (fs_s_break) that's incremented
     each time any of the fileservers in the cell reinitialises.

     Since the new counter can be accessed without RCU from the vnode, we
     can check that first - and only if it differs, get the RCU read lock
     and check the volume's server list.

 (2) Replace afs_get_s_break_rcu() with afs_check_server_good() which now
     indicates whether the callback promise is still expected to be present
     on the server.  This does the checks as described in (1).

 (3) Restructure afs_check_validity() to take account of the change in (2).

     We can also get rid of the valid variable and just use the need_clear
     variable with the addition of the afs_cb_break_no_promise reason.

 (4) afs_check_validity() probably shouldn't be altering vnode->cb_v_break
     and vnode->cb_s_break when it doesn't have cb_lock exclusively locked.

     Move the change to vnode->cb_v_break to __afs_break_callback().

     Delegate the change to vnode->cb_s_break to afs_select_fileserver()
     and set vnode->cb_fs_s_break there also.

 (5) afs_validate() no longer needs to get the RCU read lock around its
     call to afs_check_validity() - and can skip the call entirely if we
     don't have a promise.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Markus Suvanto <markus.suvanto@gmail.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/163111669583.283156.1397603105683094563.stgit@warthog.procyon.org.uk/
2021-09-13 09:10:39 +01:00
..
9p.h
afs.h afs: Try to avoid taking RCU read lock when checking vnode validity 2021-09-13 09:10:39 +01:00
alarmtimer.h
asoc.h ASoC: soc-core: tidyup jack.h 2020-11-30 12:54:01 +00:00
avc.h selinux: add basic filtering for audit trace events 2020-08-21 17:07:29 -04:00
bcache.h block: remove superfluous param in blk_fill_rwbs() 2021-02-22 06:37:41 -07:00
block.h blktrace: fix blk_rq_merge documentation 2021-02-22 06:37:41 -07:00
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 Tracing updates for 5.14: 2021-07-03 11:13:22 -07:00
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 clk: Trace clk_set_rate() "range" functions 2020-12-17 01:54:31 -08:00
cma.h mm, tracing: unify PFN format strings 2021-06-29 10:53:52 -07:00
compaction.h mm/page_alloc: integrate classzone_idx and high_zoneidx 2020-06-03 20:09:44 -07:00
context_tracking.h
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 PM / devfreq: Add tracepoint for frequency changes 2020-10-26 10:52:37 +09:00
devlink.h devlink: Add a tracepoint for trap reports 2020-09-30 18:01:26 -07:00
dma_fence.h treewide: Add missing semicolons to __assign_str uses 2021-06-30 09:19:14 -04:00
erofs.h erofs: convert uncompressed files from readpages to readahead 2020-06-02 10:59:07 -07:00
error_report.h tracing: add error_report_end trace point 2021-02-26 09:41:02 -08:00
ext4.h ext4: delete some unused tracepoint definitions 2021-04-02 11:38:06 -04:00
f2fs.h f2fs: move ioctl interface definitions to separated file 2020-11-02 08:33:02 -08:00
fib6.h ipv6: Add fib6_type and fib6_flags to fib6_result 2019-04-17 23:11:30 -07:00
fib.h net: Replace nhc_has_gw with nhc_gw_family 2019-04-08 15:22:40 -07:00
filelock.h locks: Remove extra "0x" in tracepoint format specifier 2020-09-01 18:09:34 -04:00
filemap.h mm, tracing: unify PFN format strings 2021-06-29 10:53:52 -07:00
fs_dax.h
fscache.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
fsi_master_aspeed.h fsi: aspeed: Add trace points 2019-11-08 11:28:20 +01:00
fsi_master_ast_cf.h
fsi_master_gpio.h
fsi.h trace: fsi: Print transfer size unsigned 2019-11-08 11:23:37 +01:00
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
huge_memory.h khugepaged: introduce 'max_ptes_shared' tunable 2020-06-03 20:09:46 -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
intel_iommu.h iommu/vt-d: Add prq_report trace event 2021-06-10 09:06:13 +02:00
intel_ish.h
intel-sst.h
io_uring.h io_uring: minor clean up in trace events definition 2021-06-16 06:41:48 -06:00
iocost.h blk-iocost: Add iocg idle state tracepoint 2020-12-17 07:55:44 -07:00
iommu.h
ipi.h
irq_matrix.h
irq.h
iscsi.h scsi: iscsi: Capture iscsi debug messages using tracepoints 2018-12-20 20:03:55 -05:00
jbd2.h jbd2,ext4: add a shrinker to release checkpointed buffers 2021-06-24 10:54:49 -04:00
kmem.h mm, tracing: unify PFN format strings 2021-06-29 10:53:52 -07:00
kvm.h KVM: x86/mmu: Drop trace_kvm_age_page() tracepoint 2021-04-17 08:30:56 -04:00
kyber.h block: add an explicit ->disk backpointer to the request_queue 2021-08-23 12:54:31 -06:00
libata.h
lock.h
mce.h
mdio.h
migrate.h mm/gup: migrate pinned pages out of movable zone 2021-05-05 11:27:26 -07:00
mlxsw.h mlxsw: spectrum_acl: Rename rehash_dis trace 2019-03-31 11:01:23 -07:00
mmap_lock.h mm: mmap_lock: add tracepoints around lock acquisition 2020-12-15 12:13:41 -08:00
mmap.h mm: mmap: add trace point of vm_unmapped_area 2020-04-02 09:35:30 -07:00
mmc.h
mmflags.h mmflags.h: add missing __GFP_ZEROTAGS and __GFP_SKIP_KASAN_POISON names 2021-08-20 11:31:42 -07:00
module.h
mptcp.h mptcp: dump csum fields in mptcp_dump_mpext 2021-06-18 11:40:11 -07:00
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_probe_common.h
net.h net: use %px to print skb address in trace_netif_receive_skb 2021-07-15 10:28:48 -07:00
netfs.h netfs: Add a tracepoint to log failures that would be otherwise unseen 2021-04-23 10:14:32 +01:00
netlink.h netlink: add tracepoint at NL_SET_ERR_MSG 2021-02-04 18:05:59 -08:00
nilfs2.h
nmi.h
objagg.h lib: introduce initial implementation of object aggregation manager 2018-11-15 14:43:43 -08:00
oom.h
osnoise.h tracing: Fix spelling in osnoise tracer "interferences" -> "interference" 2021-06-28 14:12:27 -04:00
page_isolation.h
page_pool.h mm, tracing: unify PFN format strings 2021-06-29 10:53:52 -07:00
page_ref.h
pagemap.h mm, tracing: unify PFN format strings 2021-06-29 10:53:52 -07:00
percpu.h
power_cpu_migrate.h
power.h PM: QoS: Simplify definitions of CPU latency QoS trace events 2020-02-13 11:26:39 +01:00
preemptirq.h tracing: Change offset type to s32 in preempt/irq tracepoints 2020-01-03 11:34:37 -05:00
printk.h
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 net_sched: introduce tracepoint trace_qdisc_enqueue() 2021-07-15 10:32:38 -07:00
qla.h scsi: qla2xxx: Suppress two recently introduced compiler warnings 2020-05-19 21:43:01 -04:00
qrtr.h net: qrtr: Add tracepoint support 2020-04-22 12:55:54 -07:00
random.h random: remove dead code left over from blocking pool 2021-04-02 18:28:12 +11:00
rcu.h rcu/nocb: Unify timers 2021-05-12 12:10:23 -07:00
rdma_core.h RDMA/core: Add trace points to follow MR allocation 2020-01-07 16:10:53 -04:00
rdma.h RDMA/core: Move the rdma_show_ib_cm_event() macro 2020-08-24 16:01:47 -03:00
regulator.h regulator: core: Add regulator bypass trace points 2020-05-29 17:17:02 +01:00
rpcgss.h treewide: Add missing semicolons to __assign_str uses 2021-06-30 09:19:14 -04:00
rpcrdma.h xprtrdma: Move fr_mr field to struct rpcrdma_mr 2021-04-26 09:27:23 -04:00
rpm.h PM-runtime: add tracepoints for usage_count changes 2020-01-13 12:28:29 +01:00
rseq.h
rtc.h
rxrpc.h rxrpc: Fix a missing NULL-pointer check in a trace 2020-09-14 16:18:59 +01:00
sched.h sched/tracing: Remove the redundant 'success' in the sched tracepoint 2021-06-10 11:16:20 -04:00
scmi.h firmware: arm_scmi: Use signed integer to report transfer status 2020-06-30 14:07:08 +01:00
scsi.h scsi: core: Kill message byte 2021-05-31 22:48:24 -04:00
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
skb.h
smbus.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
sock.h net: sock: add trace for socket errors 2021-06-29 11:28:21 -07:00
spi.h spi: Enable tracing of the SPI setup CS selection 2021-05-26 21:22:13 +01:00
spmi.h
sunrpc.h treewide: Add missing semicolons to __assign_str uses 2021-06-30 09:19:14 -04:00
sunvnet.h
swiotlb.h
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 CONTROL field for trace events 2020-10-02 18:36:19 -04:00
task.h
tcp.h tcp: add tracepoint for checksum errors 2021-05-14 15:26:03 -07:00
tegra_apb_dma.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
thermal_power_allocator.h
thermal.h thermal: devfreq_cooling: change tracing function and arguments 2020-12-11 14:10:44 +01:00
thp.h
timer.h tracing: Fix various typos in comments 2021-03-23 14:08:18 -04:00
tlb.h
udp.h
ufs.h scsi: ufs: core: Enable power management for wlun 2021-05-10 22:28:20 -04:00
v4l2.h media: v4l2: abstract timeval handling in v4l2_buffer 2020-01-03 15:43:35 +01:00
vb2.h
vmscan.h include/trace/events/vmscan.h: remove mm_vmscan_inactive_list_is_low 2021-06-30 20:47:28 -07:00
vsock_virtio_transport_common.h virtio/vsock: update trace event for SEQPACKET 2021-06-11 13:32:47 -07:00
wbt.h bdi: use bdi_dev_name() to get device name 2020-05-09 16:07:39 -06:00
workqueue.h workqueue/tracing: Copy workqueue name to buffer in trace event 2021-03-18 12:57:37 -04:00
writeback.h trace: replace WB_REASON_FOREIGN_FLUSH with a string 2021-06-10 11:16:20 -04:00
xdp.h xdp: Extend xdp_redirect_map with broadcast support 2021-05-26 09:46:16 +02:00
xen.h x86/mm/tlb: Flush remote and local TLBs concurrently 2021-03-06 12:59:10 +01:00