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Message-Id: <1427813209-4401-1-git-send-email-david.ahern@oracle.com>
Date: Tue, 31 Mar 2015 10:46:49 -0400
From: David Ahern <david.ahern@...cle.com>
To: acme@...nel.org
Cc: linux-kernel@...r.kernel.org, David Ahern <david.ahern@...cle.com>,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH] perf sched: Make cpu based arrays dynamic
Remove MAX_CPUS and static array sizing in favor of run time growth.
Signed-off-by: David Ahern <david.ahern@...cle.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
tools/perf/builtin-sched.c | 84 ++++++++++++++++++++++++++++++++++++++++------
1 file changed, 73 insertions(+), 11 deletions(-)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 858d85396d81..1d111e66b6b3 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -30,7 +30,6 @@
#include <math.h>
#define PR_SET_NAME 15 /* Set process name */
-#define MAX_CPUS 4096
#define COMM_LEN 20
#define SYM_LEN 129
@@ -139,8 +138,6 @@ struct perf_sched {
* weird events, such as a task being switched away that is not current.
*/
int max_cpu;
- u32 curr_pid[MAX_CPUS];
- struct thread *curr_thread[MAX_CPUS];
char next_shortname1;
char next_shortname2;
unsigned int replay_repeat;
@@ -170,10 +167,15 @@ struct perf_sched {
u64 run_avg;
u64 all_runtime;
u64 all_count;
- u64 cpu_last_switched[MAX_CPUS];
struct rb_root atom_root, sorted_atom_root;
struct list_head sort_list, cmp_pid;
+ /* current allocation size for curr_pid and curr_thread */
+ int alloc_cpu;
+ u32 *curr_pid;
+ struct thread **curr_thread;
+ u64 *cpu_last_switched;
+
/* options for timehist command */
bool summary;
bool summary_only;
@@ -733,6 +735,56 @@ replay_wakeup_event(struct perf_sched *sched,
return 0;
}
+static int sched__expand_cpu_arrays(struct perf_sched *sched, int cpu)
+{
+ void *p;
+ int i;
+
+ p = realloc(sched->curr_pid, cpu * sizeof(u32));
+ if (p == NULL) {
+ pr_err("Failed to expand curr_pid array\n");
+ return -1;
+ }
+ sched->curr_pid = p;
+
+ p = realloc(sched->curr_thread, cpu * sizeof(struct thread *));
+ if (p == NULL) {
+ pr_err("Failed to expand curr_thread array\n");
+ return -1;
+ }
+ sched->curr_thread = p;
+
+ p = realloc(sched->cpu_last_switched, cpu * sizeof(u64));
+ if (p == NULL) {
+ pr_err("Failed to expand cpu_last_switched array\n");
+ return -1;
+ }
+ sched->cpu_last_switched = p;
+
+ /* initialize new slots */
+ for (i = sched->alloc_cpu; i < cpu; ++i) {
+ sched->cpu_last_switched[i] = (u64) 0;
+ sched->curr_pid[i] = -1;
+ sched->curr_thread[i] = NULL;
+ }
+
+ sched->alloc_cpu = cpu;
+
+ return 0;
+}
+
+static int sched__check_cpu_arrays(struct perf_sched *sched, int cpu)
+{
+ if (sched->alloc_cpu <= cpu) {
+ int n = __roundup_pow_of_two(cpu + 1);
+
+ if (sched__expand_cpu_arrays(sched, n) != 0)
+ return -1;
+ }
+
+ return 0;
+}
+
static int replay_switch_event(struct perf_sched *sched,
struct perf_evsel *evsel,
struct perf_sample *sample,
@@ -751,9 +803,12 @@ static int replay_switch_event(struct perf_sched *sched,
if (verbose)
printf("sched_switch event %p\n", evsel);
- if (cpu >= MAX_CPUS || cpu < 0)
+ if (cpu < 0)
return 0;
+ if (sched__check_cpu_arrays(sched, cpu) != 0)
+ return -1;
+
timestamp0 = sched->cpu_last_switched[cpu];
if (timestamp0)
delta = timestamp - timestamp0;
@@ -983,7 +1038,10 @@ static int latency_switch_event(struct perf_sched *sched,
int cpu = sample->cpu;
s64 delta;
- BUG_ON(cpu >= MAX_CPUS || cpu < 0);
+ BUG_ON(cpu < 0);
+
+ if (sched__check_cpu_arrays(sched, cpu) != 0)
+ return -1;
timestamp0 = sched->cpu_last_switched[cpu];
sched->cpu_last_switched[cpu] = timestamp;
@@ -1046,7 +1104,7 @@ static int latency_runtime_event(struct perf_sched *sched,
u64 timestamp = sample->time;
int cpu = sample->cpu;
- BUG_ON(cpu >= MAX_CPUS || cpu < 0);
+ BUG_ON(cpu < 0);
if (!atoms) {
if (thread_atoms_insert(sched, thread))
return -1;
@@ -1335,11 +1393,14 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
s64 delta;
int cpu, this_cpu = sample->cpu;
- BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
+ BUG_ON(this_cpu < 0);
if (this_cpu > sched->max_cpu)
sched->max_cpu = this_cpu;
+ if (sched__check_cpu_arrays(sched, this_cpu) != 0)
+ return -1;
+
timestamp0 = sched->cpu_last_switched[this_cpu];
sched->cpu_last_switched[this_cpu] = timestamp;
if (timestamp0)
@@ -1417,6 +1478,9 @@ static int process_sched_switch_event(struct perf_tool *tool,
u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
next_pid = perf_evsel__intval(evsel, sample, "next_pid");
+ if (sched__check_cpu_arrays(sched, this_cpu) != 0)
+ return -1;
+
if (sched->curr_pid[this_cpu] != (u32)-1) {
/*
* Are we trying to switch away a PID that is
@@ -2983,7 +3047,6 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
.switch_event = replay_switch_event,
.fork_event = replay_fork_event,
};
- unsigned int i;
sched.pid_to_task = intlist__new(NULL);
if (sched.pid_to_task == NULL) {
@@ -2991,8 +3054,7 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
return -ENOMEM;
}
- for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
- sched.curr_pid[i] = -1;
+ sched__expand_cpu_arrays(&sched, 16);
argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
--
2.3.0
--
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