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perf sched: Avoid large stack allocations

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Commit 5ded57ac1b ("perf inject: Remove static variables") moved
static variables to local, however, in this case 3 MAX_CPUS (4096)
sized arrays were moved onto the stack making the stack frame quite
large. Avoid the stack usage by dynamically allocating the arrays.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230527034324.2597593-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-05-26 20:43:19 -07:00 committed by Arnaldo Carvalho de Melo
parent e57d739334
commit 232418a0b2
1 changed files with 22 additions and 4 deletions
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26
tools/perf/builtin-sched.c
View file

@ -193,8 +193,8 @@ struct perf_sched {
* weird events, such as a task being switched away that is not current.
*/
struct perf_cpu max_cpu;
u32 curr_pid[MAX_CPUS];
struct thread *curr_thread[MAX_CPUS];
u32 *curr_pid;
struct thread **curr_thread;
char next_shortname1;
char next_shortname2;
unsigned int replay_repeat;
@ -224,7 +224,7 @@ struct perf_sched {
u64 run_avg;
u64 all_runtime;
u64 all_count;
u64 cpu_last_switched[MAX_CPUS];
u64 *cpu_last_switched;
struct rb_root_cached atom_root, sorted_atom_root, merged_atom_root;
struct list_head sort_list, cmp_pid;
bool force;
@ -3595,7 +3595,22 @@ int cmd_sched(int argc, const char **argv)
mutex_init(&sched.start_work_mutex);
mutex_init(&sched.work_done_wait_mutex);
for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
sched.curr_thread = calloc(MAX_CPUS, sizeof(*sched.curr_thread));
if (!sched.curr_thread) {
ret = -ENOMEM;
goto out;
}
sched.cpu_last_switched = calloc(MAX_CPUS, sizeof(*sched.cpu_last_switched));
if (!sched.cpu_last_switched) {
ret = -ENOMEM;
goto out;
}
sched.curr_pid = malloc(MAX_CPUS * sizeof(*sched.curr_pid));
if (!sched.curr_pid) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < MAX_CPUS; i++)
sched.curr_pid[i] = -1;
argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
@ -3664,6 +3679,9 @@ int cmd_sched(int argc, const char **argv)
}
out:
free(sched.curr_pid);
free(sched.cpu_last_switched);
free(sched.curr_thread);
mutex_destroy(&sched.start_work_mutex);
mutex_destroy(&sched.work_done_wait_mutex);