linaro-kernel August 2016

linaro-kernel@lists.linaro.org

23 participants
138 discussions

[PATCH 0/3] *** Latency trace events - irqs, prempt, critical timing ***

by Binoy Jayan

Hi all, I am sending this patch series here before public review. Please have a look and provide your insight into its correctness. These set of patches capture latency events caused by interrupts and premption disabled in kernel. The patches are based on the hist trigger feature developed by Tom Zanussi. Git-commit: 7ef224d1d0e3a1ade02d02c01ce1dcffb736d2c3 As mentioned by Daniel, there is also a good write up in the following blog by Brendan Gregg: http://www.brendangregg.com/blog/2016-06-08/linux-hist-triggers.html The perf interface for the same have not been developed yet. Related efforts: https://patchwork.kernel.org/patch/8439401 hwlat_detector tracer: https://lkml.org/lkml/2016/8/4/348 https://lkml.org/lkml/2016/8/4/346 The patch series also contains histogram triggers for missed hrtimer offsets. Dependencies: CONFIG_IRQSOFF_TRACER CONFIG_PREEMPT_TRACER CONFIG_PROVE_LOCKING CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG Usage of triggers to generate histograms: mount -t debugfs nodev /sys/kernel/debug echo 'hist:key=latency.log2:val=hitcount:sort=latency' > /sys/kernel/debug/tracing/events/latency/latency_irqs/trigger echo 'hist:key=common_pid.execname' > /sys/kernel/debug/tracing/events/latency/latency_hrtimer_interrupt/trigger CPU specific breakdown of events: echo 'hist:key=cpu,latency:val=hitcount:sort=latency' > /sys/kernel/debug/tracing/events/latency/latency_preempt/trigger echo 'hist:key=cpu,latency:val=hitcount:sort=latency if cpu==1' > /sys/kernel/debug/tracing/events/latency/latency_preempt/trigger Histogram output: cat /sys/kernel/debug/tracing/events/latency/latency_irqs/hist cat /sys/kernel/debug/tracing/events/latency/latency_preempt/hist cat /sys/kernel/debug/tracing/events/latency/latency_critical_timings/hist cat /sys/kernel/debug/tracing/events/latency/latency_hrtimer_interrupt/hist Disable a trigger: echo '!hist:key=latency.log2' > /sys/kernel/debug/tracing/events/latency/latency_irqs/trigger TODO: 1. perf interface. Not sure if this is needed 2. Effective wakeup latencies of individual processes due to irqs/premption being disabled or due to missed timers. Excerpt from Carsten Emde's patches: Effective latencies occurs during wakeup of a process. To determine effective latencies, the time stamp when a process is scheduled to be woken up has to be stored, and determines the duration of the wakeup time shortly before control is passed over to this process. Note that the apparent latency in user space may be somewhat longer, since the process may be interrupted after control is passed over to it but before the execution in user space takes place. Simply measuring the interval between enqueuing and wakeup may also not appropriate in cases when a process is scheduled as a result of a timer expiration. The timer may have missed its deadline, e.g. due to disabled interrupts, but this latency would not be registered. Therefore, the offsets of missed timers are recorded in a separate histogram. If both wakeup latency and missed timer offsets are configured and enabled, a third histogram may be enabled that records the overall latency as a sum of the timer latency, if any, and the wakeup latency. This histogram is called "timerandwakeup". Thanks, Binoy Binoy Jayan (1): latency: Histogram for missed timer offsets Daniel Wagner (2): tracing: Deference pointers without RCU checks tracing: Add trace_irqsoff tracepoints include/linux/hrtimer.h | 1 + include/linux/rculist.h | 36 ++++++++++++++++++ include/linux/tracepoint.h | 4 +- include/trace/events/latency.h | 73 +++++++++++++++++++++++++++++++++++++ kernel/time/hrtimer.c | 27 ++++++++++++++ kernel/trace/trace_events_trigger.c | 6 +-- kernel/trace/trace_irqsoff.c | 47 +++++++++++++++++++++++- 7 files changed, 188 insertions(+), 6 deletions(-) create mode 100644 include/trace/events/latency.h -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project

7 years, 9 months

master build: 0 failures 1 warnings (v4.8-rc2-173-g184ca82)

by Build bot for Mark Brown

Tree/Branch: master Git describe: v4.8-rc2-173-g184ca82 Commit: 184ca82348 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net Build Time: 92 min 9 sec Passed: 10 / 10 (100.00 %) Failed: 0 / 10 ( 0.00 %) Errors: 0 Warnings: 1 Section Mismatches: 0 ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): 1 warnings 0 mismatches : arm-allmodconfig ------------------------------------------------------------------------------- Warnings Summary: 1 1 ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- arm-allmodconfig : PASS, 0 errors, 1 warnings, 0 section mismatches Warnings: ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm64-allmodconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allnoconfig x86_64-allnoconfig arm-multi_v4t_defconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

master build: 0 failures 1 warnings (v4.8-rc2-42-g5ff132c)

by Build bot for Mark Brown

Tree/Branch: master Git describe: v4.8-rc2-42-g5ff132c Commit: 5ff132c07a Merge tag 'for-v4.8-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply Build Time: 91 min 52 sec Passed: 10 / 10 (100.00 %) Failed: 0 / 10 ( 0.00 %) Errors: 0 Warnings: 1 Section Mismatches: 0 ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): 1 warnings 0 mismatches : arm-allmodconfig ------------------------------------------------------------------------------- Warnings Summary: 1 1 ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- arm-allmodconfig : PASS, 0 errors, 1 warnings, 0 section mismatches Warnings: ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm64-allmodconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allnoconfig x86_64-allnoconfig arm-multi_v4t_defconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

next-20160817 build: 2 failures 5 warnings (next-20160817)

by Build bot for Mark Brown

Tree/Branch: next-20160817 Git describe: next-20160817 Commit: 0fc0b836f3 Add linux-next specific files for 20160817 Build Time: 82 min 51 sec Passed: 8 / 10 ( 80.00 %) Failed: 2 / 10 ( 20.00 %) Errors: 6 Warnings: 5 Section Mismatches: 0 Failed defconfigs: arm64-allmodconfig arm-allmodconfig Errors: arm64-allmodconfig ../include/linux/kernel.h:831:48: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types] ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c:140:18: error: passing argument 1 of 'dc_ops->cleanup' from incompatible pointer type [-Werror=incompatible-pointer-types] ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:994:52: error: 'dev' undeclared (first use in this function) ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1055:52: error: 'dev' undeclared (first use in this function) ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1065:1: error: expected '}' before ';' token arm-allmodconfig ../drivers/net/ethernet/mellanox/mlx5/core/debugfs.c:300:61: error: 'outb' undeclared (first use in this function) ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): 4 warnings 0 mismatches : arm64-allmodconfig 3 warnings 0 mismatches : arm-allmodconfig 1 warnings 0 mismatches : arm-multi_v5_defconfig ------------------------------------------------------------------------------- Errors summary: 6 1 ../include/linux/kernel.h:831:48: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types] 1 ../drivers/net/ethernet/mellanox/mlx5/core/debugfs.c:300:61: error: 'outb' undeclared (first use in this function) 1 ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c:140:18: error: passing argument 1 of 'dc_ops->cleanup' from incompatible pointer type [-Werror=incompatible-pointer-types] 1 ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:994:52: error: 'dev' undeclared (first use in this function) 1 ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1065:1: error: expected '}' before ';' token 1 ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1055:52: error: 'dev' undeclared (first use in this function) Warnings Summary: 5 3 ../drivers/net/dsa/mv88e6xxx/chip.c:3253:12: warning: 'mv88e6xxx_port_to_mdio_addr' defined but not used [-Wunused-function] 2 ../drivers/video/fbdev/mb862xx/mb862xx-i2c.c:160:6: warning: unused variable 'ret' [-Wunused-variable] 1 ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined 1 ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:994:21: warning: unused variable 'drm_dev' [-Wunused-variable] 1 ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1055:21: warning: unused variable 'drm_dev' [-Wunused-variable] =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- arm64-allmodconfig : FAIL, 5 errors, 4 warnings, 0 section mismatches Errors: ../include/linux/kernel.h:831:48: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types] ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c:140:18: error: passing argument 1 of 'dc_ops->cleanup' from incompatible pointer type [-Werror=incompatible-pointer-types] ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:994:52: error: 'dev' undeclared (first use in this function) ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1055:52: error: 'dev' undeclared (first use in this function) ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1065:1: error: expected '}' before ';' token Warnings: ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:994:21: warning: unused variable 'drm_dev' [-Wunused-variable] ../drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c:1055:21: warning: unused variable 'drm_dev' [-Wunused-variable] ../drivers/net/dsa/mv88e6xxx/chip.c:3253:12: warning: 'mv88e6xxx_port_to_mdio_addr' defined but not used [-Wunused-function] ../drivers/video/fbdev/mb862xx/mb862xx-i2c.c:160:6: warning: unused variable 'ret' [-Wunused-variable] ------------------------------------------------------------------------------- arm-allmodconfig : FAIL, 1 errors, 3 warnings, 0 section mismatches Errors: ../drivers/net/ethernet/mellanox/mlx5/core/debugfs.c:300:61: error: 'outb' undeclared (first use in this function) Warnings: ../drivers/net/dsa/mv88e6xxx/chip.c:3253:12: warning: 'mv88e6xxx_port_to_mdio_addr' defined but not used [-Wunused-function] ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined ../drivers/video/fbdev/mb862xx/mb862xx-i2c.c:160:6: warning: unused variable 'ret' [-Wunused-variable] ------------------------------------------------------------------------------- arm-multi_v5_defconfig : PASS, 0 errors, 1 warnings, 0 section mismatches Warnings: ../drivers/net/dsa/mv88e6xxx/chip.c:3253:12: warning: 'mv88e6xxx_port_to_mdio_addr' defined but not used [-Wunused-function] ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm-multi_v7_defconfig x86_64-defconfig arm-allnoconfig x86_64-allnoconfig arm-multi_v4t_defconfig arm64-defconfig

7 years, 9 months

next-20160816 build: 1 failures 2 warnings (next-20160816)

by Build bot for Mark Brown

Tree/Branch: next-20160816 Git describe: next-20160816 Commit: 0c9a343971 Add linux-next specific files for 20160816 Build Time: 191 min 38 sec Passed: 9 / 10 ( 90.00 %) Failed: 1 / 10 ( 10.00 %) Errors: 1 Warnings: 2 Section Mismatches: 0 Failed defconfigs: arm-allmodconfig Errors: arm-allmodconfig ../drivers/net/ethernet/mellanox/mlx5/core/debugfs.c:300:61: error: 'outb' undeclared (first use in this function) ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): 1 warnings 0 mismatches : arm64-allmodconfig 2 warnings 0 mismatches : arm-allmodconfig ------------------------------------------------------------------------------- Errors summary: 1 1 ../drivers/net/ethernet/mellanox/mlx5/core/debugfs.c:300:61: error: 'outb' undeclared (first use in this function) Warnings Summary: 2 2 ../drivers/video/fbdev/mb862xx/mb862xx-i2c.c:160:6: warning: unused variable 'ret' [-Wunused-variable] 1 ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- arm64-allmodconfig : PASS, 0 errors, 1 warnings, 0 section mismatches Warnings: ../drivers/video/fbdev/mb862xx/mb862xx-i2c.c:160:6: warning: unused variable 'ret' [-Wunused-variable] ------------------------------------------------------------------------------- arm-allmodconfig : FAIL, 1 errors, 2 warnings, 0 section mismatches Errors: ../drivers/net/ethernet/mellanox/mlx5/core/debugfs.c:300:61: error: 'outb' undeclared (first use in this function) Warnings: ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined ../drivers/video/fbdev/mb862xx/mb862xx-i2c.c:160:6: warning: unused variable 'ret' [-Wunused-variable] ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allnoconfig x86_64-allnoconfig arm-multi_v4t_defconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

master build: 0 failures 1 warnings (v4.8-rc2-37-g3ec60b9)

by Build bot for Mark Brown

Tree/Branch: master Git describe: v4.8-rc2-37-g3ec60b9 Commit: 3ec60b92d3 Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost Build Time: 91 min 49 sec Passed: 10 / 10 (100.00 %) Failed: 0 / 10 ( 0.00 %) Errors: 0 Warnings: 1 Section Mismatches: 0 ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): 1 warnings 0 mismatches : arm-allmodconfig ------------------------------------------------------------------------------- Warnings Summary: 1 1 ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- arm-allmodconfig : PASS, 0 errors, 1 warnings, 0 section mismatches Warnings: ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm64-allmodconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allnoconfig x86_64-allnoconfig arm-multi_v4t_defconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

master build: 0 failures 1 warnings (v4.8-rc2-17-gae5d68b)

by Build bot for Mark Brown

Tree/Branch: master Git describe: v4.8-rc2-17-gae5d68b Commit: ae5d68be42 Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 Build Time: 91 min 53 sec Passed: 10 / 10 (100.00 %) Failed: 0 / 10 ( 0.00 %) Errors: 0 Warnings: 1 Section Mismatches: 0 ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): 1 warnings 0 mismatches : arm-allmodconfig ------------------------------------------------------------------------------- Warnings Summary: 1 1 ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- arm-allmodconfig : PASS, 0 errors, 1 warnings, 0 section mismatches Warnings: ../drivers/tty/serial/8250/8250_fintek.c:34:0: warning: "IRQ_MODE" redefined ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm64-allmodconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allnoconfig x86_64-allnoconfig arm-multi_v4t_defconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

v4.7.1 build: 0 failures 1 warnings (v4.7.1)

by Build bot for Mark Brown

Tree/Branch: v4.7.1 Git describe: v4.7.1 Commit: 95f15f5ed6 Linux 4.7.1 Build Time: 70 min 47 sec Passed: 9 / 9 (100.00 %) Failed: 0 / 9 ( 0.00 %) Errors: 0 Warnings: 1 Section Mismatches: 0 ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): 1 warnings 0 mismatches : arm64-allmodconfig ------------------------------------------------------------------------------- Warnings Summary: 1 1 ../fs/reiserfs/ibalance.c:1156:2: warning: 'new_insert_key' may be used uninitialized in this function [-Wmaybe-uninitialized] =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- arm64-allmodconfig : PASS, 0 errors, 1 warnings, 0 section mismatches Warnings: ../fs/reiserfs/ibalance.c:1156:2: warning: 'new_insert_key' may be used uninitialized in this function [-Wmaybe-uninitialized] ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allmodconfig arm-allnoconfig x86_64-allnoconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

v4.6.7 build: 0 failures 0 warnings (v4.6.7)

by Build bot for Mark Brown

Tree/Branch: v4.6.7 Git describe: v4.6.7 Commit: 096998b119 Linux 4.6.7 Build Time: 77 min 31 sec Passed: 9 / 9 (100.00 %) Failed: 0 / 9 ( 0.00 %) Errors: 0 Warnings: 0 Section Mismatches: 0 ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): ------------------------------------------------------------------------------- =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm64-allmodconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allmodconfig arm-allnoconfig x86_64-allnoconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

v4.4.18 build: 0 failures 0 warnings (v4.4.18)

by Build bot for Mark Brown

Tree/Branch: v4.4.18 Git describe: v4.4.18 Commit: e4884275a4 Linux 4.4.18 Build Time: 126 min 30 sec Passed: 9 / 9 (100.00 %) Failed: 0 / 9 ( 0.00 %) Errors: 0 Warnings: 0 Section Mismatches: 0 ------------------------------------------------------------------------------- defconfigs with issues (other than build errors): ------------------------------------------------------------------------------- =============================================================================== Detailed per-defconfig build reports below: ------------------------------------------------------------------------------- Passed with no errors, warnings or mismatches: arm64-allnoconfig arm64-allmodconfig arm-multi_v5_defconfig arm-multi_v7_defconfig x86_64-defconfig arm-allmodconfig arm-allnoconfig x86_64-allnoconfig arm64-defconfig close failed in file object destructor: sys.excepthook is missing lost sys.stderr

7 years, 9 months

← Newer
1
...
4
5
6
7
8
9
10
...
14
Older →

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

linaro-kernel August 2016