Yun Wang
3d6c50c27b
sched/debug: Show the sum wait time of a task group ...
Although we can rely on cpuacct to present the CPU usage of task
groups, it is hard to tell how intense the competition is between
these groups on CPU resources.
Monitoring the wait time or sched_debug of each process could be
very expensive, and there is no good way to accurately represent the
conflict with these info, we need the wait time on group dimension.
Thus we introduce group's wait_sum to represent the resource conflict
between task groups, which is simply the sum of the wait time of
the group's cfs_rq.
The 'cpu.stat' is modified to show the statistic, like:
nr_periods 0
nr_throttled 0
throttled_time 0
wait_sum 2035098795584
Now we can monitor the changes of wait_sum to tell how much a
a task group is suffering in the fight of CPU resources.
For example:
(wait_sum - last_wait_sum) * 100 / (nr_cpu * period_ns) == X%
means the task group paid X percentage of period on waiting
for the CPU.
Signed-off-by: Michael Wang <yun.wang@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/ff7dae3b-e5f9-7157-1caa-ff02c6b23dc1@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-07-25 11:41:05 +02:00
bpf: don't leave partial mangled prog in jit_subprogs error path
2018-07-12 14:00:54 -07:00
docs: Fix some broken references
2018-06-15 18:10:01 -03:00
kconfig: tinyconfig: remove stale stack protector fixups
2018-06-15 07:15:28 +09:00
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
swiotlb: export swiotlb_dma_ops
2018-06-28 14:00:40 +02:00
perf/core: Move inline keyword at the beginning of declaration
2018-06-27 09:55:58 +02:00
gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT
2018-06-08 18:56:02 +09:00
genirq/debugfs: Add missing IRQCHIP_SUPPORTS_LEVEL_MSI debug
2018-06-22 14:22:00 +02:00
livepatch: Allow to call a custom callback when freeing shadow variables
2018-04-17 13:42:48 +02:00
Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-06-24 19:36:16 +08:00
sched/swait: Rename to exclusive
2018-06-20 11:35:56 +02:00
Printk changes for 4.18
2018-06-06 16:04:55 -07:00
sched/swait: Rename to exclusive
2018-06-20 11:35:56 +02:00
sched/debug: Show the sum wait time of a task group
2018-07-25 11:41:05 +02:00
Revert "tick: Prefer a lower rating device only if it's CPU local device"
2018-07-10 22:12:47 +02:00
tracing: Reorder display of TGID to be after PID
2018-07-12 19:56:25 -04:00
kernel/async.c: revert "async: simplify lowest_in_progress()"
2018-02-06 18:32:44 -08:00
audit: use inline function to get audit context
2018-05-14 17:24:18 -04:00
audit: track the owner of the command mutex ourselves
2018-02-23 11:22:22 -05:00
fsnotify: add fsnotify_add_inode_mark() wrappers
2018-05-18 14:58:22 +02:00
fsnotify: add fsnotify_add_inode_mark() wrappers
2018-05-18 14:58:22 +02:00
\n
2018-06-17 05:06:18 +09:00
audit: use existing session info function
2018-05-18 15:47:54 -04:00
audit: Fix wrong task in comparison of session ID
2018-05-21 14:27:43 -04:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-06-04 20:27:54 -07:00
watchdog/softlockup: Replace "watchdog/%u" threads with cpu_stop_work
2018-07-03 09:20:43 +02:00
mm: split page_type out from _mapcount
2018-06-07 17:34:37 -07:00
delayacct: Use raw_spinlocks
2018-04-27 14:34:51 +02:00
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
kernel: use kernel_wait4() instead of sys_wait4()
2018-04-02 20:14:51 +02:00
extable: Make init_kernel_text() global
2018-02-21 16:54:06 +01:00
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
mm: make vm_area_alloc() initialize core fields
2018-07-21 15:24:03 -07:00
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
kernel/hung_task.c: show all hung tasks before panic
2018-06-07 17:34:39 -07:00
memremap: split devm_memremap_pages() and memremap() infrastructure
2018-05-15 23:08:33 -07:00
jump_label: Disable jump labels in __exit code
2018-03-20 08:57:17 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
2018-02-01 13:36:15 -08:00
sched/core / kcov: avoid kcov_area during task switch
2018-06-15 07:55:24 +09:00
kexec: call do_kexec_load() in compat syscall directly
2018-04-02 20:15:01 +02:00
kexec: yield to scheduler when loading kimage segments
2018-06-15 07:55:24 +09:00
treewide: Use array_size() in vzalloc()
2018-06-12 16:19:22 -07:00
kprobes: Fix random address output of blacklist file
2018-04-25 10:27:56 -04:00
kthread: Simplify kthread_park() completion
2018-07-03 09:20:44 +02:00
dma-mapping: move all DMA mapping code to kernel/dma
2018-06-14 08:50:37 +02:00
mm: introduce MEMORY_DEVICE_FS_DAX and CONFIG_DEV_PAGEMAP_OPS
2018-05-22 06:59:39 -07:00
Modules updates for v4.18
2018-06-16 07:36:39 +09:00
Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables
2018-06-14 12:21:18 +09:00
kernel/params.c: downgrade warning for unsafe parameters
2018-04-11 10:28:37 -07:00
xarray: add the xa_lock to the radix_tree_root
2018-04-11 10:28:39 -07:00
Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2018-04-03 19:15:32 -07:00
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
kernel/relay.c: change return type to vm_fault_t
2018-06-15 07:55:24 +09:00
libnvdimm for 4.18
2018-06-08 17:21:52 -07:00
rseq: uapi: Declare rseq_cs field as union, update includes
2018-07-10 22:18:52 +02:00
audit/stable-4.18 PR 20180605
2018-06-06 16:34:00 -07:00
signal: Remove no longer required irqsave/restore
2018-06-10 06:14:01 +02:00
smpboot: Remove cpumask from the API
2018-07-03 09:20:44 +02:00
Mark HI and TASKLET softirq synchronous
2018-07-17 11:12:43 -07:00
stop_machine: Disable preemption after queueing stopper threads
2018-07-25 11:25:08 +02:00
mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct
2018-06-07 17:34:34 -07:00
Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-06-10 10:17:09 -07:00
sched/sysctl: Remove unused sched_time_avg_ms sysctl
2018-07-16 00:16:29 +02:00
staging: irda: remove remaining remants of irda code removal
2018-04-16 11:26:49 +02:00
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
rcu: Rename cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs()
2018-05-15 10:27:29 -07:00
tracepoints: Fix the descriptions of tracepoint_probe_register{_prio}
2018-05-28 12:49:51 -04:00
headers: untangle kmemleak.h from mm.h
2018-04-05 21:36:27 -07:00
fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers
2018-04-02 20:15:59 +02:00
kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c
2018-04-02 20:15:30 +02:00
umh: fix race condition
2018-06-07 16:56:28 -04:00
efivarfs: Limit the rate for non-root to read files
2018-02-22 10:21:02 -08:00
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
uts: create "struct uts_namespace" from kmem_cache
2018-04-11 10:28:35 -07:00
watchdog/softlockup: Fix cpu_stop_queue_work() double-queue bug
2018-07-15 23:51:19 +02:00
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
workqueue: Set worker->desc to workqueue name by default
2018-05-18 08:47:13 -07:00
3d6c50c27b