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perf record: Extend trace writing to multi AIO

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Multi AIO trace writing allows caching more kernel data into userspace
memory postponing trace writing for the sake of overall profiling data
thruput increase. It could be seen as kernel data buffer extension into
userspace memory.

With an --aio option value different from 0 (default value is 1) the
tool has capability to cache more and more data into user space along
with delegating spill to AIO.

That allows avoiding to suspend at record__aio_sync() between calls of
record__mmap_read_evlist() and increases profiling data thruput at the
cost of userspace memory.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/050bb053-e7f3-aa83-fde7-f27ff90be7f6@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexey Budankov 2018-11-06 12:07:19 +03:00 committed by Arnaldo Carvalho de Melo
parent d3d1af6f01
commit 93f20c0fe3
4 changed files with 102 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/perf/Documentation/perf-record.txt
View File

@ -435,8 +435,8 @@ Specify vmlinux path which has debuginfo.
--buildid-all::
Record build-id of all DSOs regardless whether it's actually hit or not.
--aio::
Enable asynchronous (Posix AIO) trace writing mode.
--aio[=n]::
Use <n> control blocks in asynchronous (Posix AIO) trace writing mode (default: 1, max: 4).
Asynchronous mode is supported only when linking Perf tool with libc library
providing implementation for Posix AIO API.

67
tools/perf/builtin-record.c
View File

@ -196,16 +196,35 @@ static int record__aio_complete(struct perf_mmap *md, struct aiocb *cblock)
return rc;
}
static void record__aio_sync(struct perf_mmap *md)
static int record__aio_sync(struct perf_mmap *md, bool sync_all)
{
struct aiocb *cblock = &md->aio.cblock;
struct aiocb **aiocb = md->aio.aiocb;
struct aiocb *cblocks = md->aio.cblocks;
struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */
int i, do_suspend;
do {
if (cblock->aio_fildes == -1 || record__aio_complete(md, cblock))
return;
do_suspend = 0;
for (i = 0; i < md->aio.nr_cblocks; ++i) {
if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
if (sync_all)
aiocb[i] = NULL;
else
return i;
} else {
/*
* Started aio write is not complete yet
* so it has to be waited before the
* next allocation.
*/
aiocb[i] = &cblocks[i];
do_suspend = 1;
}
}
if (!do_suspend)
return -1;
while (aio_suspend((const struct aiocb**)&cblock, 1, &timeout)) {
while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
if (!(errno == EAGAIN || errno == EINTR))
pr_err("failed to sync perf data, error: %m\n");
}
@ -252,28 +271,36 @@ static void record__aio_mmap_read_sync(struct record *rec)
struct perf_mmap *map = &maps[i];
if (map->base)
record__aio_sync(map);
record__aio_sync(map, true);
}
}
static int nr_cblocks_default = 1;
static int nr_cblocks_max = 4;
static int record__aio_parse(const struct option *opt,
const char *str __maybe_unused,
const char *str,
int unset)
{
struct record_opts *opts = (struct record_opts *)opt->value;
if (unset)
if (unset) {
opts->nr_cblocks = 0;
else
opts->nr_cblocks = nr_cblocks_default;
} else {
if (str)
opts->nr_cblocks = strtol(str, NULL, 0);
if (!opts->nr_cblocks)
opts->nr_cblocks = nr_cblocks_default;
}
return 0;
}
#else /* HAVE_AIO_SUPPORT */
static void record__aio_sync(struct perf_mmap *md __maybe_unused)
static int nr_cblocks_max = 0;
static int record__aio_sync(struct perf_mmap *md __maybe_unused, bool sync_all __maybe_unused)
{
return -1;
}
static int record__aio_pushfn(void *to __maybe_unused, struct aiocb *cblock __maybe_unused,
@ -728,12 +755,13 @@ static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evli
goto out;
}
} else {
int idx;
/*
* Call record__aio_sync() to wait till map->data buffer
* becomes available after previous aio write request.
*/
record__aio_sync(map);
if (perf_mmap__aio_push(map, rec, record__aio_pushfn, &off) != 0) {
idx = record__aio_sync(map, false);
if (perf_mmap__aio_push(map, rec, idx, record__aio_pushfn, &off) != 0) {
record__aio_set_pos(trace_fd, off);
rc = -1;
goto out;
@ -1503,6 +1531,13 @@ static int perf_record_config(const char *var, const char *value, void *cb)
var = "call-graph.record-mode";
return perf_default_config(var, value, cb);
}
#ifdef HAVE_AIO_SUPPORT
if (!strcmp(var, "record.aio")) {
rec->opts.nr_cblocks = strtol(value, NULL, 0);
if (!rec->opts.nr_cblocks)
rec->opts.nr_cblocks = nr_cblocks_default;
}
#endif
return 0;
}
@ -1909,8 +1944,8 @@ static struct option __record_options[] = {
OPT_BOOLEAN(0, "dry-run", &dry_run,
"Parse options then exit"),
#ifdef HAVE_AIO_SUPPORT
OPT_CALLBACK_NOOPT(0, "aio", &record.opts,
NULL, "Enable asynchronous trace writing mode",
OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
&nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
record__aio_parse),
#endif
OPT_END()
@ -2105,6 +2140,8 @@ int cmd_record(int argc, const char **argv)
goto out;
}
if (rec->opts.nr_cblocks > nr_cblocks_max)
rec->opts.nr_cblocks = nr_cblocks_max;
if (verbose > 0)
pr_info("nr_cblocks: %d\n", rec->opts.nr_cblocks);

64
tools/perf/util/mmap.c
View File

@ -156,28 +156,50 @@ void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __mayb
#ifdef HAVE_AIO_SUPPORT
static int perf_mmap__aio_mmap(struct perf_mmap *map, struct mmap_params *mp)
{
int delta_max;
int delta_max, i, prio;
map->aio.nr_cblocks = mp->nr_cblocks;
if (map->aio.nr_cblocks) {
map->aio.data = malloc(perf_mmap__mmap_len(map));
map->aio.aiocb = calloc(map->aio.nr_cblocks, sizeof(struct aiocb *));
if (!map->aio.aiocb) {
pr_debug2("failed to allocate aiocb for data buffer, error %m\n");
return -1;
}
map->aio.cblocks = calloc(map->aio.nr_cblocks, sizeof(struct aiocb));
if (!map->aio.cblocks) {
pr_debug2("failed to allocate cblocks for data buffer, error %m\n");
return -1;
}
map->aio.data = calloc(map->aio.nr_cblocks, sizeof(void *));
if (!map->aio.data) {
pr_debug2("failed to allocate data buffer, error %m\n");
return -1;
}
/*
* Use cblock.aio_fildes value different from -1
* to denote started aio write operation on the
* cblock so it requires explicit record__aio_sync()
* call prior the cblock may be reused again.
*/
map->aio.cblock.aio_fildes = -1;
/*
* Allocate cblock with max priority delta to
* have faster aio write system calls.
*/
delta_max = sysconf(_SC_AIO_PRIO_DELTA_MAX);
map->aio.cblock.aio_reqprio = delta_max;
for (i = 0; i < map->aio.nr_cblocks; ++i) {
map->aio.data[i] = malloc(perf_mmap__mmap_len(map));
if (!map->aio.data[i]) {
pr_debug2("failed to allocate data buffer area, error %m");
return -1;
}
/*
* Use cblock.aio_fildes value different from -1
* to denote started aio write operation on the
* cblock so it requires explicit record__aio_sync()
* call prior the cblock may be reused again.
*/
map->aio.cblocks[i].aio_fildes = -1;
/*
* Allocate cblocks with priority delta to have
* faster aio write system calls because queued requests
* are kept in separate per-prio queues and adding
* a new request will iterate thru shorter per-prio
* list. Blocks with numbers higher than
* _SC_AIO_PRIO_DELTA_MAX go with priority 0.
*/
prio = delta_max - i;
map->aio.cblocks[i].aio_reqprio = prio >= 0 ? prio : 0;
}
}
return 0;
@ -189,7 +211,7 @@ static void perf_mmap__aio_munmap(struct perf_mmap *map)
zfree(&map->aio.data);
}
int perf_mmap__aio_push(struct perf_mmap *md, void *to,
int perf_mmap__aio_push(struct perf_mmap *md, void *to, int idx,
int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off),
off_t *off)
{
@ -204,7 +226,7 @@ int perf_mmap__aio_push(struct perf_mmap *md, void *to,
return (rc == -EAGAIN) ? 0 : -1;
/*
* md->base data is copied into md->data buffer to
* md->base data is copied into md->data[idx] buffer to
* release space in the kernel buffer as fast as possible,
* thru perf_mmap__consume() below.
*
@ -226,20 +248,20 @@ int perf_mmap__aio_push(struct perf_mmap *md, void *to,
buf = &data[md->start & md->mask];
size = md->mask + 1 - (md->start & md->mask);
md->start += size;
memcpy(md->aio.data, buf, size);
memcpy(md->aio.data[idx], buf, size);
size0 = size;
}
buf = &data[md->start & md->mask];
size = md->end - md->start;
md->start += size;
memcpy(md->aio.data + size0, buf, size);
memcpy(md->aio.data[idx] + size0, buf, size);
/*
* Increment md->refcount to guard md->data buffer
* Increment md->refcount to guard md->data[idx] buffer
* from premature deallocation because md object can be
* released earlier than aio write request started
* on mmap->data is complete.
* on mmap->data[idx] is complete.
*
* perf_mmap__put() is done at record__aio_complete()
* after started request completion.
@ -249,7 +271,7 @@ int perf_mmap__aio_push(struct perf_mmap *md, void *to,
md->prev = head;
perf_mmap__consume(md);
rc = push(to, &md->aio.cblock, md->aio.data, size0 + size, *off);
rc = push(to, &md->aio.cblocks[idx], md->aio.data[idx], size0 + size, *off);
if (!rc) {
*off += size0 + size;
} else {

9
tools/perf/util/mmap.h
View File

@ -32,8 +32,9 @@ struct perf_mmap {
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
#ifdef HAVE_AIO_SUPPORT
struct {
void *data;
struct aiocb cblock;
void **data;
struct aiocb *cblocks;
struct aiocb **aiocb;
int nr_cblocks;
} aio;
#endif
@ -97,11 +98,11 @@ union perf_event *perf_mmap__read_event(struct perf_mmap *map);
int perf_mmap__push(struct perf_mmap *md, void *to,
int push(struct perf_mmap *map, void *to, void *buf, size_t size));
#ifdef HAVE_AIO_SUPPORT
int perf_mmap__aio_push(struct perf_mmap *md, void *to,
int perf_mmap__aio_push(struct perf_mmap *md, void *to, int idx,
int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off),
off_t *off);
#else
static inline int perf_mmap__aio_push(struct perf_mmap *md __maybe_unused, void *to __maybe_unused,
static inline int perf_mmap__aio_push(struct perf_mmap *md __maybe_unused, void *to __maybe_unused, int idx __maybe_unused,
int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off) __maybe_unused,
off_t *off __maybe_unused)
{