ba957ebb54
When --idle-hist option is used with --summary, it now shows idle stats
with callchains like below:
Idle stats by callchain:
CPU 0: 902.195 msec
Idle time (msec) Count Callchains
---------------- ------- --------------------------------------------------
370.589 69 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- entry_SYSCALL_64_fastpath
178.799 17 worker_thread <- kthread <- ret_from_fork
128.352 17 schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork
125.111 19 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_select <- core_sys_select
71.599 50 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
23.146 1 rcu_gp_kthread <- kthread <- ret_from_fork
4.510 1 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- do_syscall_64
0.085 1 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- do_restart_poll
...
Committer notes:
Extra testing:
# uname -a
Linux jouet 4.8.8-300.fc25.x86_64 #1 SMP Tue Nov 15 18:10:06 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
1) Run 'perf sched record -g'
2) Run 'perf sched timehist --idle --summary'
<SNIP>
Idle stats by callchain:
CPU 0: 13456.840 msec
Idle time (msec) Count Callchains
---------------- ----- --------------------------------------------------
5386.637 3283 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
2750.238 2299 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- do_syscall_64
1275.672 1287 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- entry_SYSCALL_64_fastpath
936.322 452 worker_thread <- kthread <- ret_from_fork
741.311 385 rcu_nocb_kthread <- kthread <- ret_from_fork
729.385 248 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_ppoll
365.386 229 irq_thread <- kthread <- ret_from_fork
338.934 265 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- entry_SYSCALL_64_fastpath
219.488 201 schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork
186.839 410 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- do_syscall_64
142.541 59 kvm_vcpu_block <- kvm_arch_vcpu_ioctl_run <- kvm_vcpu_ioctl <- do_vfs_ioctl <- sys_ioctl
83.887 92 smpboot_thread_fn <- kthread <- ret_from_fork
62.722 96 do_exit <- do_group_exit <- 0x2a5594 <- entry_SYSCALL_64_fastpath
47.894 83 pipe_wait <- pipe_read <- __vfs_read <- vfs_read <- sys_read
46.554 61 rcu_gp_kthread <- kthread <- ret_from_fork
34.337 21 schedule_timeout <- intel_fbc_work_fn <- process_one_work <- worker_thread <- kthread
29.521 14 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_select <- core_sys_select
20.274 10 schedule_timeout <- io_schedule_timeout <- bit_wait_io <- __wait_on_bit <- out_of_line_wait_on_bit
15.085 55 schedule_timeout <- unix_stream_read_generic <- unix_stream_recvmsg <- sock_recvmsg <- SYSC_recvfrom
<SNIP>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20161208144755.16673-7-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.