Messages in this thread Patch in this message | | | Subject | [PATCH v8 09/12] perf record: implement -z,--compression_level=n option | From | Alexey Budankov <> | Date | Thu, 14 Mar 2019 14:36:19 +0300 |
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Implemented -z,--compression_level=n option that enables compression of mmaped kernel data buffers content in runtime during perf record mode collection. Default option value is 1 (fastest compression).
Compression overhead has been measured for serial and AIO streaming when profiling matrix multiplication workload:
------------------------------------------------------------- | SERIAL | AIO-1 | ----------------------------------------------------------------| |-z | OVH(x) | ratio(x) size(MiB) | OVH(x) | ratio(x) size(MiB) | |---------------------------------------------------------------| | 0 | 1,00 | 1,000 179,424 | 1,00 | 1,000 187,527 | | 1 | 1,04 | 8,427 181,148 | 1,01 | 8,474 188,562 | | 2 | 1,07 | 8,055 186,953 | 1,03 | 7,912 191,773 | | 3 | 1,04 | 8,283 181,908 | 1,03 | 8,220 191,078 | | 5 | 1,09 | 8,101 187,705 | 1,05 | 7,780 190,065 | | 8 | 1,05 | 9,217 179,191 | 1,12 | 6,111 193,024 | -----------------------------------------------------------------
OVH = (Execution time with -z N) / (Execution time with -z 0)
ratio - compression ratio size - number of bytes that was compressed
size ~= trace size x ratio
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com> --- tools/perf/Documentation/perf-record.txt | 5 +++++ tools/perf/builtin-record.c | 27 +++++++++++++++++++++++- 2 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 8eb3f5b57202..f5c886fde243 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -471,6 +471,11 @@ Also at some cases executing less trace write syscalls with bigger data size can shorter than executing more trace write syscalls with smaller data size thus lowering runtime profiling overhead. +-z:: +--compression-level=n:: +Produce compressed trace using specified level n (default: 1 - fastest compression, +22 - smallest trace) + --all-kernel:: Configure all used events to run in kernel space. diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index d23be2a82cf3..e0da9100e52f 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -346,7 +346,7 @@ static void record__aio_mmap_read_sync(struct record *rec) struct perf_evlist *evlist = rec->evlist; struct perf_mmap *maps = evlist->mmap; - if (!rec->opts.nr_cblocks) + if (!record__aio_enabled(rec)) return; for (i = 0; i < evlist->nr_mmaps; i++) { @@ -440,6 +440,26 @@ static int record__mmap_flush_parse(const struct option *opt, return 0; } +#ifdef HAVE_ZSTD_SUPPORT +static unsigned int comp_level_default = 1; +static int record__parse_comp_level(const struct option *opt, + const char *str, + int unset) +{ + struct record_opts *opts = (struct record_opts *)opt->value; + + if (unset) { + opts->comp_level = 0; + } else { + if (str) + opts->comp_level = strtol(str, NULL, 0); + if (!opts->comp_level) + opts->comp_level = comp_level_default; + } + + return 0; +} +#endif static unsigned int comp_level_max = 22; static int record__comp_enabled(struct record *rec) @@ -2168,6 +2188,11 @@ static struct option __record_options[] = { OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu", "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer", record__parse_affinity), +#ifdef HAVE_ZSTD_SUPPORT + OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, + &comp_level_default, "n", "Produce compressed trace using specified level (default: 1 - fastest, 22 - smallest trace)", + record__parse_comp_level), +#endif OPT_END() }; -- 2.20.1
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