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Date: Thu, 25 Jun 2009 06:20:13 -0500 From: Robin Holt <holt@....com> To: Corrado Zoccolo <czoccolo@...il.com> Cc: Linux-Kernel <linux-kernel@...r.kernel.org>, Arjan van de Ven <arjan@...ux.intel.com> Subject: Re: What is swapper, and why it is causing so many wakeups? Search include/linux/init_task.h for swapper. It defines the task that each processor executes when their runqueue is empty. All you are seeing is task-wise idle cpu that is servicing interrupts, etc and completing work. Good Luck, Robin On Wed, Jun 24, 2009 at 04:16:19PM +0200, Corrado Zoccolo wrote: > Hi, > my /proc/timer_stats shows a lot of activity due to 'swapper'. > It is currently the main cause of wakeups on my netbook, an acer > aspire one with Atom N270 cpu. > The funny thing is that I have no swap partition, so I don't think > swapper should have so much work to do. > Is there a way to reduce its activity? > > Timer Stats Version: v0.2 > Sample period: 298.025 s > 23207, 0 swapper hrtimer_start_range_ns (tick_sched_timer) > 23806, 0 swapper hrtimer_start_range_ns (tick_sched_timer) > 651, 2615 lxterminal hrtimer_start_range_ns (hrtimer_wakeup) > 3275D, 1520 S50cpufreq cpufreq_governor_dbs (delayed_work_timer_fn) > 3373D, 1520 S50cpufreq cpufreq_governor_dbs (delayed_work_timer_fn) > 60, 0 swapper page_writeback_init (wb_timer_fn) > 60, 2582 xscreensaver hrtimer_start_range_ns (hrtimer_wakeup) > 21, 2139 X hrtimer_start (it_real_fn) > 1684, 0 swapper hrtimer_start (tick_sched_timer) > 279, 2139 X queue_delayed_work (delayed_work_timer_fn) > 297, 2585 lxpanel hrtimer_start_range_ns (hrtimer_wakeup) > 298, 2272 ifplugd hrtimer_start_range_ns (hrtimer_wakeup) > 149, 2156 ifplugd hrtimer_start_range_ns (hrtimer_wakeup) > 37, 2139 X hrtimer_start_range_ns (hrtimer_wakeup) > 30, 2221 ip ath5k_start (ath5k_calibrate) > 1040, 0 swapper hrtimer_start (tick_sched_timer) > 38, 1 swapper neigh_table_init_no_netlink (neigh_periodic_timer) > 50, 2156 ifplugd __netdev_watchdog_up (dev_watchdog) > 75, 1 swapper neigh_table_init_no_netlink (neigh_periodic_timer) > 284D, 1 swapper schedule_delayed_work_on (delayed_work_timer_fn) > 273D, 1 swapper schedule_delayed_work_on (delayed_work_timer_fn) > 149, 2545 net_applet hrtimer_start_range_ns (hrtimer_wakeup) > 149, 1 swapper schedule_delayed_work_on (delayed_work_timer_fn) > 149, 1 swapper schedule_delayed_work_on (delayed_work_timer_fn) > 60, 1 init hrtimer_start_range_ns (hrtimer_wakeup) > 24, 1321 btrfs-transacti schedule_timeout (process_timeout) > 137, 1 swapper enqueue_task_rt (sched_rt_period_timer) > 74, 2594 menu-cached hrtimer_start_range_ns (hrtimer_wakeup) > 48, 2269 wpa_supplicant hrtimer_start_range_ns (hrtimer_wakeup) > 1296, 484 phy0 queue_delayed_work (delayed_work_timer_fn) > 30, 1 swapper sta_info_start (sta_info_cleanup) > 2, 0 swapper neigh_add_timer (neigh_timer_handler) > 3, 1276 mount start_this_handle (commit_timeout) > 1, 2998 iwgetid do_acct_process (acct_timeout) > 5, 1 swapper queue_delayed_work (delayed_work_timer_fn) > 2, 479 async/1 scsi_request_fn (blk_rq_timed_out_timer) > 5, 1708 crond hrtimer_start_range_ns (hrtimer_wakeup) > 10, 1564 syslogd hrtimer_start (it_real_fn) > 9, 1756 hald hrtimer_start_range_ns (hrtimer_wakeup) > 1, 1 swapper inet_init (inet_frag_secret_rebuild) > 1, 1 swapper flow_cache_init (flow_cache_new_hashrnd) > 1, 1 swapper ipv6_frag_init (inet_frag_secret_rebuild) > 3, 0 swapper addrconf_verify (addrconf_verify) > 1, 1 swapper queue_delayed_work (delayed_work_timer_fn) > 1, 3017 modprobe do_acct_process (acct_timeout) > 1, 252 ksuspend_usbd schedule_timeout (process_timeout) > 1, 252 ksuspend_usbd schedule_timeout (process_timeout) > 1, 252 ksuspend_usbd schedule_timeout (process_timeout) > 8, 258 khubd schedule_timeout (process_timeout) > 110, 0 swapper ehci_work (ehci_watchdog) > 2, 258 khubd schedule_timeout (process_timeout) > 2, 258 khubd schedule_timeout (process_timeout) > 1, 3044 usb-stor-scan schedule_timeout (process_timeout) > 1, 3058 scsi_scan_2 scsi_request_fn (blk_rq_timed_out_timer) > 4, 3043 usb-storage schedule_timeout (process_timeout) > 1, 3043 usb-storage schedule_timeout (process_timeout) > 1, 3043 usb-storage schedule_timeout (process_timeout) > 1, 258 khubd schedule_timeout (process_timeout) > 1, 3070 usb-stor-scan schedule_timeout (process_timeout) > 1, 3086 async/0 schedule_timeout (process_timeout) > 1, 3084 scsi_scan_3 scsi_request_fn (blk_rq_timed_out_timer) > 1, 3042 pam_console_app do_acct_process (acct_timeout) > 2, 1 swapper inet_initpeers (peer_check_expire) > 1, 3144 iwgetid do_acct_process (acct_timeout) > 1, 1312 btrfs-endio-met schedule_timeout (process_timeout) > 1, 3151 modprobe do_acct_process (acct_timeout) > 9, 2139 X vt_ioctl (kd_nosound) > 1, 3176 modprobe do_acct_process (acct_timeout) > 10, 3235 iwlist hrtimer_start_range_ns (hrtimer_wakeup) > 8, 2615 lxterminal hrtimer_start_range_ns (hrtimer_wakeup) > 1, 3003 less do_acct_process (acct_timeout) > 61320 total events, 205.994 events/sec > > -- > __________________________________________________________________________ > > dott. Corrado Zoccolo mailto:czoccolo@...il.com > PhD - Department of Computer Science - University of Pisa, Italy > -------------------------------------------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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