kernel.git/tools/perf/builtin-sched.c, branch master

perf sched stats: Define macro for SEP_LEN

2026-01-28T18:18:39Z

Define a macro for separator length of the line in perf sched stats report. Reviewed-by: Shrikanth Hegde Signed-off-by: Swapnil Sapkal Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Anubhav Shelat Cc: Chen Yu Cc: Gautham Shenoy Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Thomas Falcon Signed-off-by: Arnaldo Carvalho de Melo

perf sched stats: correct spelling of function name

2026-01-28T18:18:35Z

Replace store_schedtstat_cpu_diff() with store_schedstat_cpu_diff() Reviewed-by: Shrikanth Hegde Signed-off-by: Swapnil Sapkal Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Anubhav Shelat Cc: Chen Yu Cc: Gautham Shenoy Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Thomas Falcon Signed-off-by: Arnaldo Carvalho de Melo

perf sched stats: Add NULL check for cd_map

2026-01-28T18:18:31Z

In perf_sched__schedstat_live(), build_cpu_domain_map() returns the pointer to cpu_domain_map which can also be NULL. Add NULL check for the same to avoid NULL pointer dereference. Fixes: 00093b3133984ffe ("perf sched stats: Add support for live mode") Reviewed-by: Shrikanth Hegde Signed-off-by: Swapnil Sapkal Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Anubhav Shelat Cc: Chen Yu Cc: Gautham Shenoy Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Thomas Falcon Signed-off-by: Arnaldo Carvalho de Melo

perf sched stats: Add support for diff subcommand

2026-01-22T15:46:03Z

`perf sched stats diff` subcommand will take two perf.data files as an input and it will print the diff between the two perf.data files. The default input to this subcommnd is perf.data.old and perf.data. Example usage: # perf sched stats diff sample1.data sample2.data Description ---------------------------------------------------------------------------------------------------- DESC -> Description of the field COUNT -> Value of the field PCT_CHANGE -> Percent change with corresponding base value AVG_JIFFIES -> Avg time in jiffies between two consecutive occurrence of event ---------------------------------------------------------------------------------------------------- Time elapsed (in jiffies) : 1, 1 ---------------------------------------------------------------------------------------------------- CPU: ---------------------------------------------------------------------------------------------------- DESC COUNT1 COUNT2 PCT_CHANGE PCT_CHANGE1 PCT_CHANGE2 ---------------------------------------------------------------------------------------------------- yld_count : 0, 0 | 0.00% | array_exp : 0, 0 | 0.00% | sched_count : 0, 0 | 0.00% | sched_goidle : 0, 0 | 0.00% | ( 0.00%, 0.00% ) ttwu_count : 0, 0 | 0.00% | ttwu_local : 0, 0 | 0.00% | ( 0.00%, 0.00% ) rq_cpu_time : 32565, 33525 | 2.95% | run_delay : 0, 436 | 0.00% | ( 0.00%, 1.30% ) pcount : 0, 0 | 0.00% | ---------------------------------------------------------------------------------------------------- CPU: | DOMAIN: SMT ---------------------------------------------------------------------------------------------------- DESC COUNT1 COUNT2 PCT_CHANGE AVG_JIFFIES1 AVG_JIFFIES2 ----------------------------------------- ------------------------------------------ busy_lb_count : 0, 0 | 0.00% | $ 0.00, 0.00 $ busy_lb_balanced : 0, 0 | 0.00% | $ 0.00, 0.00 $ busy_lb_failed : 0, 0 | 0.00% | $ 0.00, 0.00 $ busy_lb_imbalance_load : 0, 0 | 0.00% | busy_lb_imbalance_util : 0, 0 | 0.00% | busy_lb_imbalance_task : 0, 0 | 0.00% | busy_lb_imbalance_misfit : 0, 0 | 0.00% | busy_lb_gained : 0, 0 | 0.00% | busy_lb_hot_gained : 0, 0 | 0.00% | busy_lb_nobusyq : 0, 0 | 0.00% | $ 0.00, 0.00 $ busy_lb_nobusyg : 0, 0 | 0.00% | $ 0.00, 0.00 $ *busy_lb_success_count : 0, 0 | 0.00% | *busy_lb_avg_pulled : 0.00, 0.00 | 0.00% | ... and so on. Output contains the diff of aggregated data of all the busy, idle and newidle categories for all the sched domains in the system. Signed-off-by: Ravi Bangoria Signed-off-by: Swapnil Sapkal Tested-by: Chen Yu Acked-by: Ian Rogers Acked-by: Peter Zijlstra Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Anubhav Shelat Cc: Ben Gainey Cc: Blake Jones Cc: Chun-Tse Shao Cc: David Vernet Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Gautham Shenoy Cc: Graham Woodward Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Juri Lelli Cc: K Prateek Nayak Cc: Kan Liang Cc: Leo Yan Cc: Madadi Vineeth Reddy Cc: Mark Rutland Cc: Namhyung Kim Cc: Sandipan Das Cc: Santosh Shukla Cc: Shrikanth Hegde Cc: Steven Rostedt (VMware) Cc: Tejun Heo Cc: Thomas Falcon Cc: Tim Chen Cc: Vincent Guittot Cc: Yang Jihong Cc: Yujie Liu Cc: Zhongqiu Han Signed-off-by: Arnaldo Carvalho de Melo

perf sched stats: Add support for live mode

2026-01-22T15:44:03Z

The live mode works similar to simple `perf stat` command, by profiling the target and printing results on the terminal as soon as the target finishes. Example usage: # perf sched stats -- true Description ---------------------------------------------------------------------------------------------------- DESC -> Description of the field COUNT -> Value of the field PCT_CHANGE -> Percent change with corresponding base value AVG_JIFFIES -> Avg time in jiffies between two consecutive occurrence of event ---------------------------------------------------------------------------------------------------- Time elapsed (in jiffies) : 1 ---------------------------------------------------------------------------------------------------- CPU: ---------------------------------------------------------------------------------------------------- DESC COUNT PCT_CHANGE ---------------------------------------------------------------------------------------------------- yld_count : 0 array_exp : 0 sched_count : 0 sched_goidle : 0 ( 0.00% ) ttwu_count : 0 ttwu_local : 0 ( 0.00% ) rq_cpu_time : 27875 run_delay : 0 ( 0.00% ) pcount : 0 ---------------------------------------------------------------------------------------------------- CPU: | DOMAIN: SMT ---------------------------------------------------------------------------------------------------- DESC COUNT AVG_JIFFIES ----------------------------------------- ------------------------------------------ busy_lb_count : 0 $ 0.00 $ busy_lb_balanced : 0 $ 0.00 $ busy_lb_failed : 0 $ 0.00 $ busy_lb_imbalance_load : 0 busy_lb_imbalance_util : 0 busy_lb_imbalance_task : 0 busy_lb_imbalance_misfit : 0 busy_lb_gained : 0 busy_lb_hot_gained : 0 busy_lb_nobusyq : 0 $ 0.00 $ busy_lb_nobusyg : 0 $ 0.00 $ *busy_lb_success_count : 0 *busy_lb_avg_pulled : 0.00 ... and so on. Output will show similar data for all the cpus in the system. Co-developed-by: Ravi Bangoria Signed-off-by: Ravi Bangoria Signed-off-by: Swapnil Sapkal Tested-by: Chen Yu Tested-by: James Clark Acked-by: Ian Rogers Acked-by: Peter Zijlstra Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Anubhav Shelat Cc: Ben Gainey Cc: Blake Jones Cc: Chun-Tse Shao Cc: David Vernet Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Gautham Shenoy Cc: Graham Woodward Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Juri Lelli Cc: K Prateek Nayak Cc: Kan Liang Cc: Leo Yan Cc: Madadi Vineeth Reddy Cc: Mark Rutland Cc: Namhyung Kim Cc: Sandipan Das Cc: Santosh Shukla Cc: Shrikanth Hegde Cc: Steven Rostedt (VMware) Cc: Tejun Heo Cc: Thomas Falcon Cc: Tim Chen Cc: Vincent Guittot Cc: Yang Jihong Cc: Yujie Liu Cc: Zhongqiu Han [ Avoid potentially using 'sv' uninitialized by calling free_cpu_domain_info() only when build_cpu_domain_map() is called ] Signed-off-by: Arnaldo Carvalho de Melo

perf sched stats: Add support for report subcommand

2026-01-22T15:31:52Z

`perf sched stats record` captures two sets of samples. For workload profile, first set right before workload starts and second set after workload finishes. For the systemwide profile, first set at the beginning of profile and second set on receiving SIGINT signal. Add `perf sched stats report` subcommand that will read both the set of samples, get the diff and render a final report. Final report prints scheduler stat at cpu granularity as well as sched domain granularity. Example usage: # ./perf sched stats record -- true [ perf sched stats: Wrote samples to perf.data ] # perf sched stats report Description ---------------------------------------------------------------------------------------------------- DESC -> Description of the field COUNT -> Value of the field PCT_CHANGE -> Percent change with corresponding base value AVG_JIFFIES -> Avg time in jiffies between two consecutive occurrence of event ---------------------------------------------------------------------------------------------------- Time elapsed (in jiffies) : 1 ---------------------------------------------------------------------------------------------------- CPU: ---------------------------------------------------------------------------------------------------- DESC COUNT PCT_CHANGE ---------------------------------------------------------------------------------------------------- yld_count : 0 array_exp : 0 sched_count : 0 sched_goidle : 0 ( 0.00% ) ttwu_count : 0 ttwu_local : 0 ( 0.00% ) rq_cpu_time : 33525 run_delay : 436 ( 1.30% ) pcount : 0 ---------------------------------------------------------------------------------------------------- CPU: | DOMAIN: SMT ---------------------------------------------------------------------------------------------------- DESC COUNT AVG_JIFFIES ----------------------------------------- ------------------------------------------ busy_lb_count : 0 $ 0.00 $ busy_lb_balanced : 0 $ 0.00 $ busy_lb_failed : 0 $ 0.00 $ busy_lb_imbalance_load : 0 busy_lb_imbalance_util : 0 busy_lb_imbalance_task : 0 busy_lb_imbalance_misfit : 0 busy_lb_gained : 0 busy_lb_hot_gained : 0 busy_lb_nobusyq : 0 $ 0.00 $ busy_lb_nobusyg : 0 $ 0.00 $ *busy_lb_success_count : 0 *busy_lb_avg_pulled : 0.00 ... and so on. Output shows similar data for all the cpus in the system. Co-developed-by: Ravi Bangoria Signed-off-by: Ravi Bangoria Signed-off-by: Swapnil Sapkal Tested-by: Chen Yu Tested-by: James Clark Acked-by: Ian Rogers Acked-by: Peter Zijlstra Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Anubhav Shelat Cc: Ben Gainey Cc: Blake Jones Cc: Chun-Tse Shao Cc: David Vernet Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Gautham Shenoy Cc: Graham Woodward Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Juri Lelli Cc: K Prateek Nayak Cc: Kan Liang Cc: Leo Yan Cc: Madadi Vineeth Reddy Cc: Mark Rutland Cc: Namhyung Kim Cc: Sandipan Das Cc: Santosh Shukla Cc: Shrikanth Hegde Cc: Steven Rostedt (VMware) Cc: Tejun Heo Cc: Thomas Falcon Cc: Tim Chen Cc: Vincent Guittot Cc: Yang Jihong Cc: Yujie Liu Cc: Zhongqiu Han Signed-off-by: Arnaldo Carvalho de Melo

perf sched stats: Add record and rawdump support

2026-01-22T15:29:28Z

Define new, perf tool only, sample types and their layouts. Add logic to parse /proc/schedstat, convert it to perf sample format and save samples to perf.data file with `perf sched stats record` command. Also add logic to read perf.data file, interpret schedstat samples and print rawdump of samples with `perf script -D`. Note that, /proc/schedstat file output is standardized with version number. The patch supports v15 but older or newer version can be added easily. Co-developed-by: Ravi Bangoria Signed-off-by: Ravi Bangoria Signed-off-by: Swapnil Sapkal Tested-by: Chen Yu Tested-by: James Clark Acked-by: Ian Rogers Acked-by: Peter Zijlstra Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Anubhav Shelat Cc: Ben Gainey Cc: Blake Jones Cc: Chun-Tse Shao Cc: David Vernet Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Gautham Shenoy Cc: Graham Woodward Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Juri Lelli Cc: K Prateek Nayak Cc: Kan Liang Cc: Leo Yan Cc: Madadi Vineeth Reddy Cc: Mark Rutland Cc: Namhyung Kim Cc: Sandipan Das Cc: Santosh Shukla Cc: Shrikanth Hegde Cc: Steven Rostedt (VMware) Cc: Tejun Heo Cc: Thomas Falcon Cc: Tim Chen Cc: Vincent Guittot Cc: Yang Jihong Cc: Yujie Liu Cc: Zhongqiu Han [ PRIu64 needs uint64_t, not 'unsigned long' to work on both 32-bit and 64-bit ] Signed-off-by: Arnaldo Carvalho de Melo

perf sched: Avoid union type punning undefined behavior

2025-10-01T14:22:04Z

A union is used to set the priv value in thread (a void*) to a boolean value through type punning. Undefined behavior sanitizer fails on this. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo

perf session: Add accessor for session->header.env

2025-07-25T17:37:56Z

The perf_env from the header in the session is frequently accessed, add an accessor function rather than access directly. Cache the value to avoid repeated calls. No behavioral change. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250724163302.596743-10-irogers@google.com Signed-off-by: Namhyung Kim

perf sched timehist: decode process names of processes in zombie state

2025-07-18T00:05:07Z

Previously when running perf trace timehist --state, when recording processes in the zombie state the process name would not be decoded properly and appears with just the PID: 1140057.412177 [0006] Mutter Input Th[3139/3104] 0.956 0.019 0.041 S 1140057.412222 [0012] :1248612[1248612] 0.000 0.000 0.332 Z 1140057.412275 [0004] 0.052 0.052 0.953 I 1140057.412284 [0008] 0.070 0.070 0.932 I 1140057.412333 [0004] KMS thread[3126/3104] 0.953 0.112 0.058 S Now some extra processing has been added to decode the process name: 1140057.412177 [0006] Mutter Input Th[3139/3104] 0.956 0.019 0.041 S 1140057.412222 [0012] sleep[1248612] 0.000 0.000 0.332 Z 1140057.412275 [0004] 0.052 0.052 0.953 I 1140057.412284 [0008] 0.070 0.070 0.932 I 1140057.412333 [0004] KMS thread[3126/3104] 0.953 0.112 0.058 S Signed-off-by: Anubhav Shelat Link: https://lore.kernel.org/r/20250716203914.45772-2-ashelat@redhat.com Signed-off-by: Namhyung Kim