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perf sched replay: Realloc the memory of pid_to_task stepwise to adapt to the different pid_max configurations
Although the memory of pid_to_task can be allocated via calloc according to the value of /proc/sys/kernel/pid_max, it cannot handle the case when pid_max is changed after 'perf sched record' has created its perf.data. If the new pid_max configured in 'perf sched replay' is smaller than the old pid_max configured in 'perf sched record', then it will cause the assertion failure problem. To solve this problem, we realloc the memory of pid_to_task stepwise once the passed-in pid parameter in register_pid is larger than the current pid_max. Example: Test environment: x86_64 with 160 cores $ cat /proc/sys/kernel/pid_max 163840 $ perf sched record ls $ echo 5000 > /proc/sys/kernel/pid_max $ cat /proc/sys/kernel/pid_max 5000 Before this patch: $ perf sched replay run measurement overhead: 221 nsecs sleep measurement overhead: 55356 nsecs the run test took 1000011 nsecs the sleep test took 1060940 nsecs perf: builtin-sched.c:337: register_pid: Assertion `!(pid >= (unsigned long)pid_max)' failed. Aborted After this patch: $ perf sched replay run measurement overhead: 221 nsecs sleep measurement overhead: 55611 nsecs the run test took 1000026 nsecs the sleep test took 1060486 nsecs nr_run_events: 10 nr_sleep_events: 1562 nr_wakeup_events: 5 task 0 ( :1: 1), nr_events: 1 task 1 ( :2: 2), nr_events: 1 task 2 ( :3: 3), nr_events: 1 task 3 ( :5: 5), nr_events: 1 ... Signed-off-by: Yunlong Song <yunlong.song@huawei.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1427809596-29559-5-git-send-email-yunlong.song@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -334,7 +334,12 @@ static struct task_desc *register_pid(struct perf_sched *sched,
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pid_max = MAX_PID;
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BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
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}
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BUG_ON(pid >= (unsigned long)pid_max);
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if (pid >= (unsigned long)pid_max) {
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BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
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sizeof(struct task_desc *))) == NULL);
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while (pid >= (unsigned long)pid_max)
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sched->pid_to_task[pid_max++] = NULL;
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}
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task = sched->pid_to_task[pid];
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