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binder: change binder_stats to atomics

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Use atomics for stats to avoid needing to lock for
increments/decrements

Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Badhri Jagan Sridharan 2017-06-29 12:01:44 -07:00 • committed by Greg Kroah-Hartman
parent c44b1231ff
commit 0953c7976c
1 changed files with 28 additions and 20 deletions
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48
drivers/android/binder.c
View file

@ -167,22 +167,22 @@ enum binder_stat_types {
}; };
struct binder_stats { struct binder_stats {
int br[_IOC_NR(BR_FAILED_REPLY) + 1]; atomic_t br[_IOC_NR(BR_FAILED_REPLY) + 1];
int bc[_IOC_NR(BC_REPLY_SG) + 1]; atomic_t bc[_IOC_NR(BC_REPLY_SG) + 1];
int obj_created[BINDER_STAT_COUNT]; atomic_t obj_created[BINDER_STAT_COUNT];
int obj_deleted[BINDER_STAT_COUNT]; atomic_t obj_deleted[BINDER_STAT_COUNT];
}; };
static struct binder_stats binder_stats; static struct binder_stats binder_stats;
static inline void binder_stats_deleted(enum binder_stat_types type) static inline void binder_stats_deleted(enum binder_stat_types type)
{ {
binder_stats.obj_deleted[type]++; atomic_inc(&binder_stats.obj_deleted[type]);
} }
static inline void binder_stats_created(enum binder_stat_types type) static inline void binder_stats_created(enum binder_stat_types type)
{ {
binder_stats.obj_created[type]++; atomic_inc(&binder_stats.obj_created[type]);
} }
struct binder_transaction_log_entry { struct binder_transaction_log_entry {
@ -1825,9 +1825,9 @@ static int binder_thread_write(struct binder_proc *proc,
ptr += sizeof(uint32_t); ptr += sizeof(uint32_t);
trace_binder_command(cmd); trace_binder_command(cmd);
if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) { if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
binder_stats.bc[_IOC_NR(cmd)]++; atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]);
proc->stats.bc[_IOC_NR(cmd)]++; atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]);
thread->stats.bc[_IOC_NR(cmd)]++; atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]);
} }
switch (cmd) { switch (cmd) {
case BC_INCREFS: case BC_INCREFS:
@ -2201,9 +2201,9 @@ static void binder_stat_br(struct binder_proc *proc,
{ {
trace_binder_return(cmd); trace_binder_return(cmd);
if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) { if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
binder_stats.br[_IOC_NR(cmd)]++; atomic_inc(&binder_stats.br[_IOC_NR(cmd)]);
proc->stats.br[_IOC_NR(cmd)]++; atomic_inc(&proc->stats.br[_IOC_NR(cmd)]);
thread->stats.br[_IOC_NR(cmd)]++; atomic_inc(&thread->stats.br[_IOC_NR(cmd)]);
} }
} }
@ -3453,17 +3453,21 @@ static void print_binder_stats(struct seq_file *m, const char *prefix,
BUILD_BUG_ON(ARRAY_SIZE(stats->bc) != BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
ARRAY_SIZE(binder_command_strings)); ARRAY_SIZE(binder_command_strings));
for (i = 0; i < ARRAY_SIZE(stats->bc); i++) { for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
if (stats->bc[i]) int temp = atomic_read(&stats->bc[i]);
if (temp)
seq_printf(m, "%s%s: %d\n", prefix, seq_printf(m, "%s%s: %d\n", prefix,
binder_command_strings[i], stats->bc[i]); binder_command_strings[i], temp);
} }
BUILD_BUG_ON(ARRAY_SIZE(stats->br) != BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
ARRAY_SIZE(binder_return_strings)); ARRAY_SIZE(binder_return_strings));
for (i = 0; i < ARRAY_SIZE(stats->br); i++) { for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
if (stats->br[i]) int temp = atomic_read(&stats->br[i]);
if (temp)
seq_printf(m, "%s%s: %d\n", prefix, seq_printf(m, "%s%s: %d\n", prefix,
binder_return_strings[i], stats->br[i]); binder_return_strings[i], temp);
} }
BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
@ -3471,11 +3475,15 @@ static void print_binder_stats(struct seq_file *m, const char *prefix,
BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
ARRAY_SIZE(stats->obj_deleted)); ARRAY_SIZE(stats->obj_deleted));
for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) { for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
if (stats->obj_created[i] || stats->obj_deleted[i]) int created = atomic_read(&stats->obj_created[i]);
seq_printf(m, "%s%s: active %d total %d\n", prefix, int deleted = atomic_read(&stats->obj_deleted[i]);
if (created || deleted)
seq_printf(m, "%s%s: active %d total %d\n",
prefix,
binder_objstat_strings[i], binder_objstat_strings[i],
stats->obj_created[i] - stats->obj_deleted[i], created - deleted,
stats->obj_created[i]); created);
} }
} }