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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

Bug: 33250092 32225111
Change-Id: I13e69b7f0485ccf16673e25091455781e1933a98
Signed-off-by: Todd Kjos <tkjos@google.com>
This commit is contained in:
Badhri Jagan Sridharan
2016-10-13 16:36:15 -07:00
committed by Thierry Strudel
parent fd24ab4afc
commit c363358e81
1 changed files with 29 additions and 19 deletions
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48
drivers/android/binder.c
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@@ -176,22 +176,22 @@ enum binder_stat_types {
};
struct binder_stats {
int br[_IOC_NR(BR_FAILED_REPLY) + 1];
int bc[_IOC_NR(BC_REPLY_SG) + 1];
int obj_created[BINDER_STAT_COUNT];
int obj_deleted[BINDER_STAT_COUNT];
atomic_t br[_IOC_NR(BR_FAILED_REPLY) + 1];
atomic_t bc[_IOC_NR(BC_REPLY_SG) + 1];
atomic_t obj_created[BINDER_STAT_COUNT];
atomic_t obj_deleted[BINDER_STAT_COUNT];
};
static struct binder_stats binder_stats;
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)
{
binder_stats.obj_created[type]++;
atomic_inc(&binder_stats.obj_created[type]);
}
struct binder_transaction_log_entry {
@@ -1832,9 +1832,9 @@ static int binder_thread_write(struct binder_proc *proc,
ptr += sizeof(uint32_t);
trace_binder_command(cmd);
if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
binder_stats.bc[_IOC_NR(cmd)]++;
proc->stats.bc[_IOC_NR(cmd)]++;
thread->stats.bc[_IOC_NR(cmd)]++;
atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]);
atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]);
atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]);
}
switch (cmd) {
case BC_INCREFS:
@@ -2205,9 +2205,9 @@ static void binder_stat_br(struct binder_proc *proc,
{
trace_binder_return(cmd);
if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
binder_stats.br[_IOC_NR(cmd)]++;
proc->stats.br[_IOC_NR(cmd)]++;
thread->stats.br[_IOC_NR(cmd)]++;
atomic_inc(&binder_stats.br[_IOC_NR(cmd)]);
atomic_inc(&proc->stats.br[_IOC_NR(cmd)]);
atomic_inc(&thread->stats.br[_IOC_NR(cmd)]);
}
}
@@ -3459,30 +3459,40 @@ static void print_binder_stats(struct seq_file *m, const char *prefix,
BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
ARRAY_SIZE(binder_command_strings));
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,
binder_command_strings[i], stats->bc[i]);
binder_command_strings[i], temp);
}
BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
ARRAY_SIZE(binder_return_strings));
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,
binder_return_strings[i], stats->br[i]);
binder_return_strings[i], temp);
}
BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
ARRAY_SIZE(binder_objstat_strings));
BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
ARRAY_SIZE(stats->obj_deleted));
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]);
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],
stats->obj_created[i] - stats->obj_deleted[i],
stats->obj_created[i]);
created - deleted,
created);
}
}