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sched: include group statistics in /proc/sched_debug
Impact: extend /proc/sched_debug info Since the statistics of a group entity isn't exported directly from the kernel, it becomes difficult to obtain some of the group statistics. For example, the current method to obtain exec time of a group entity is not always accurate. One has to read the exec times of all the tasks(/proc/<pid>/sched) in the group and add them. This method fails (or becomes difficult) if we want to collect stats of a group over a duration where tasks get created and terminated. This patch makes it easier to obtain group stats by directly including them in /proc/sched_debug. Stats like group exec time would help user programs (like LTP) to accurately measure the group fairness. An example output of group stats from /proc/sched_debug: cfs_rq[3]:/3/a/1 .exec_clock : 89.598007 .MIN_vruntime : 0.000001 .min_vruntime : 256300.970506 .max_vruntime : 0.000001 .spread : 0.000000 .spread0 : -25373.372248 .nr_running : 0 .load : 0 .yld_exp_empty : 0 .yld_act_empty : 0 .yld_both_empty : 0 .yld_count : 4474 .sched_switch : 0 .sched_count : 40507 .sched_goidle : 12686 .ttwu_count : 15114 .ttwu_local : 11950 .bkl_count : 67 .nr_spread_over : 0 .shares : 0 .se->exec_start : 113676.727170 .se->vruntime : 1592.612714 .se->sum_exec_runtime : 89.598007 .se->wait_start : 0.000000 .se->sleep_start : 0.000000 .se->block_start : 0.000000 .se->sleep_max : 0.000000 .se->block_max : 0.000000 .se->exec_max : 1.000282 .se->slice_max : 1.999750 .se->wait_max : 54.981093 .se->wait_sum : 217.610521 .se->wait_count : 50 .se->load.weight : 2 Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Acked-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Acked-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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1 changed files with 36 additions and 1 deletions
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@ -53,6 +53,40 @@ static unsigned long nsec_low(unsigned long long nsec)
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#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
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#ifdef CONFIG_FAIR_GROUP_SCHED
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static void print_cfs_group_stats(struct seq_file *m, int cpu,
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struct task_group *tg)
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{
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struct sched_entity *se = tg->se[cpu];
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if (!se)
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return;
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#define P(F) \
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SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
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#define PN(F) \
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SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
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PN(se->exec_start);
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PN(se->vruntime);
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PN(se->sum_exec_runtime);
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#ifdef CONFIG_SCHEDSTATS
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PN(se->wait_start);
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PN(se->sleep_start);
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PN(se->block_start);
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PN(se->sleep_max);
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PN(se->block_max);
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PN(se->exec_max);
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PN(se->slice_max);
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PN(se->wait_max);
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PN(se->wait_sum);
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P(se->wait_count);
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#endif
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P(se->load.weight);
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#undef PN
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#undef P
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}
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#endif
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static void
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print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
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{
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@ -181,6 +215,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
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#ifdef CONFIG_SMP
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SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares);
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#endif
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print_cfs_group_stats(m, cpu, cfs_rq->tg);
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#endif
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}
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@ -261,7 +296,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
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u64 now = ktime_to_ns(ktime_get());
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int cpu;
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SEQ_printf(m, "Sched Debug Version: v0.07, %s %.*s\n",
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SEQ_printf(m, "Sched Debug Version: v0.08, %s %.*s\n",
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init_utsname()->release,
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(int)strcspn(init_utsname()->version, " "),
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init_utsname()->version);
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