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Output bin lock profiling results to malloc_stats.

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Two counters are included for the small bins: lock contention rate, and
max lock waiting time.
This commit is contained in:
Qi Wang
2017-03-03 19:58:43 -08:00
committed by Qi Wang
parent 6309df628f
commit a4f176af57
8 changed files with 120 additions and 34 deletions
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99
src/stats.c
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@@ -32,6 +32,31 @@ bool opt_stats_print = false;
/******************************************************************************/
/* Calculate x.yyy and output a string (takes a fixed sized char array). */
static bool
get_rate_str(uint64_t dividend, uint64_t divisor, char str[6]) {
if (divisor == 0 || dividend > divisor) {
/* The rate is not supposed to be greater than 1. */
return true;
}
if (dividend > 0) {
assert(UINT64_MAX / dividend >= 1000);
}
unsigned n = (unsigned)((dividend * 1000) / divisor);
if (n < 10) {
malloc_snprintf(str, 6, "0.00%u", n);
} else if (n < 100) {
malloc_snprintf(str, 6, "0.0%u", n);
} else if (n < 1000) {
malloc_snprintf(str, 6, "0.%u", n);
} else {
malloc_snprintf(str, 6, "1");
}
return false;
}
static void
stats_arena_bins_print(void (*write_cb)(void *, const char *), void *cbopaque,
bool json, bool large, unsigned i) {
@@ -51,13 +76,14 @@ stats_arena_bins_print(void (*write_cb)(void *, const char *), void *cbopaque,
"bins: size ind allocated nmalloc"
" ndalloc nrequests curregs"
" curslabs regs pgs util nfills"
" nflushes newslabs reslabs\n");
" nflushes newslabs reslabs"
" contention max_wait\n");
} else {
malloc_cprintf(write_cb, cbopaque,
"bins: size ind allocated nmalloc"
" ndalloc nrequests curregs"
" curslabs regs pgs util newslabs"
" reslabs\n");
" reslabs contention max_wait\n");
}
}
for (j = 0, in_gap = false; j < nbins; j++) {
@@ -100,6 +126,9 @@ stats_arena_bins_print(void (*write_cb)(void *, const char *), void *cbopaque,
uint64_t);
CTL_M2_M4_GET("stats.arenas.0.bins.0.curslabs", i, j, &curslabs,
size_t);
lock_prof_data_t lock_data;
CTL_M2_M4_GET("stats.arenas.0.bins.0.lock_data", i, j,
&lock_data, lock_prof_data_t);
if (json) {
malloc_cprintf(write_cb, cbopaque,
@@ -127,55 +156,59 @@ stats_arena_bins_print(void (*write_cb)(void *, const char *), void *cbopaque,
curslabs,
(j + 1 < nbins) ? "," : "");
} else if (!in_gap) {
size_t availregs, milli;
char util[6]; /* "x.yyy". */
availregs = nregs * curslabs;
milli = (availregs != 0) ? (1000 * curregs) / availregs
: 1000;
if (milli > 1000) {
/*
* Race detected: the counters were read in
* separate mallctl calls and concurrent
* operations happened in between. In this case
* no meaningful utilization can be computed.
*/
malloc_snprintf(util, sizeof(util), " race");
} else if (milli < 10) {
malloc_snprintf(util, sizeof(util),
"0.00%zu", milli);
} else if (milli < 100) {
malloc_snprintf(util, sizeof(util), "0.0%zu",
milli);
} else if (milli < 1000) {
malloc_snprintf(util, sizeof(util), "0.%zu",
milli);
} else {
assert(milli == 1000);
malloc_snprintf(util, sizeof(util), "1");
size_t availregs = nregs * curslabs;
char util[6];
if (get_rate_str((uint64_t)curregs, (uint64_t)availregs,
util)) {
if (availregs == 0) {
malloc_snprintf(util, sizeof(util),
"1");
} else if (curregs > availregs) {
/*
* Race detected: the counters were read
* in separate mallctl calls and
* concurrent operations happened in
* between. In this case no meaningful
* utilization can be computed.
*/
malloc_snprintf(util, sizeof(util),
" race");
} else {
not_reached();
}
}
char rate[6];
if (get_rate_str(lock_data.n_wait_times,
lock_data.n_lock_ops, rate)) {
if (lock_data.n_lock_ops == 0) {
malloc_snprintf(rate, sizeof(rate),
"0");
}
}
uint64_t max_wait = nstime_msec(
&lock_data.max_wait_time);
if (config_tcache) {
malloc_cprintf(write_cb, cbopaque,
"%20zu %3u %12zu %12"FMTu64
" %12"FMTu64" %12"FMTu64" %12zu"
" %12zu %4u %3zu %-5s %12"FMTu64
" %12"FMTu64" %12"FMTu64" %12"FMTu64"\n",
" %12"FMTu64" %12"FMTu64" %12"FMTu64
" %12s %12"FMTu64"\n",
reg_size, j, curregs * reg_size, nmalloc,
ndalloc, nrequests, curregs, curslabs,
nregs, slab_size / page, util, nfills,
nflushes, nslabs, nreslabs);
nflushes, nslabs, nreslabs, rate, max_wait);
} else {
malloc_cprintf(write_cb, cbopaque,
"%20zu %3u %12zu %12"FMTu64
" %12"FMTu64" %12"FMTu64" %12zu"
" %12zu %4u %3zu %-5s %12"FMTu64
" %12"FMTu64"\n",
" %12"FMTu64" %12s\n",
reg_size, j, curregs * reg_size, nmalloc,
ndalloc, nrequests, curregs, curslabs,
nregs, slab_size / page, util, nslabs,
nreslabs);
nreslabs, rate);
}
}
}