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Message-ID: <e92d3f86-baa5-0e62-50bd-151f33969baa@linux.intel.com>
Date: Mon, 16 Nov 2020 15:14:50 +0300
From: Alexey Budankov <alexey.budankov@...ux.intel.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...ux.intel.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
Alexander Antonov <alexander.antonov@...ux.intel.com>
Subject: [PATCH v3 01/12] perf record: introduce thread affinity and mmap
masks
Introduce affinity and mmap thread masks. Thread affinity mask
defines cpus that a thread is allowed to run on. Thread maps
mask defines mmap data buffers the thread serves to stream
profiling data from.
Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
---
tools/perf/builtin-record.c | 116 ++++++++++++++++++++++++++++++++++++
1 file changed, 116 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index adf311d15d3d..82f009703ad7 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -85,6 +85,11 @@ struct switch_output {
int cur_file;
};
+struct thread_mask {
+ struct mmap_cpu_mask maps;
+ struct mmap_cpu_mask affinity;
+};
+
struct record {
struct perf_tool tool;
struct record_opts opts;
@@ -108,6 +113,8 @@ struct record {
unsigned long long samples;
struct mmap_cpu_mask affinity_mask;
unsigned long output_max_size; /* = 0: unlimited */
+ struct thread_mask *thread_masks;
+ int nr_threads;
};
static volatile int done;
@@ -2174,6 +2181,45 @@ static int record__parse_affinity(const struct option *opt, const char *str, int
return 0;
}
+static int record__mmap_cpu_mask_alloc(struct mmap_cpu_mask *mask, int nr_bits)
+{
+ mask->nbits = nr_bits;
+ mask->bits = bitmap_alloc(mask->nbits);
+ if (!mask->bits) {
+ pr_err("Failed to allocate mmap_cpu mask\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void record__mmap_cpu_mask_free(struct mmap_cpu_mask *mask)
+{
+ bitmap_free(mask->bits);
+ mask->nbits = 0;
+}
+
+static void record__thread_mask_clear(struct thread_mask *mask)
+{
+ bitmap_zero(mask->maps.bits, mask->maps.nbits);
+ bitmap_zero(mask->affinity.bits, mask->affinity.nbits);
+}
+
+static int record__thread_mask_alloc(struct thread_mask *mask, int nr_bits)
+{
+ if (record__mmap_cpu_mask_alloc(&mask->maps, nr_bits) ||
+ record__mmap_cpu_mask_alloc(&mask->affinity, nr_bits))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void record__thread_mask_free(struct thread_mask *mask)
+{
+ record__mmap_cpu_mask_free(&mask->maps);
+ record__mmap_cpu_mask_free(&mask->affinity);
+}
+
static int parse_output_max_size(const struct option *opt,
const char *str, int unset)
{
@@ -2603,6 +2649,69 @@ static struct option __record_options[] = {
struct option *record_options = __record_options;
+static void record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_cpu_map *cpus)
+{
+ int c;
+
+ for (c = 0; c < cpus->nr; c++)
+ set_bit(cpus->map[c], mask->bits);
+}
+
+static int record__alloc_thread_masks(struct record *rec, int nr_threads, int nr_bits)
+{
+ int t, ret;
+
+ rec->thread_masks = zalloc(nr_threads * sizeof(*(rec->thread_masks)));
+ if (!rec->thread_masks) {
+ pr_err("Failed to allocate thread masks\n");
+ return -ENOMEM;
+ }
+
+ for (t = 0; t < nr_threads; t++) {
+ ret = record__thread_mask_alloc(&rec->thread_masks[t], nr_bits);
+ if (ret)
+ return ret;
+ record__thread_mask_clear(&rec->thread_masks[t]);
+ }
+
+ return 0;
+}
+static int record__init_thread_default_masks(struct record *rec, struct perf_cpu_map *cpus)
+{
+ int ret;
+
+ ret = record__alloc_thread_masks(rec, 1, cpu__max_cpu());
+ if (ret)
+ return ret;
+
+ record__mmap_cpu_mask_init(&rec->thread_masks->maps, cpus);
+
+ rec->nr_threads = 1;
+
+ return 0;
+}
+
+static int record__init_thread_masks(struct record *rec)
+{
+ struct perf_cpu_map *cpus = rec->evlist->core.cpus;
+
+ return record__init_thread_default_masks(rec, cpus);
+}
+
+static int record__fini_thread_masks(struct record *rec)
+{
+ int t;
+
+ for (t = 0; t < rec->nr_threads; t++)
+ record__thread_mask_free(&rec->thread_masks[t]);
+
+ zfree(&rec->thread_masks);
+
+ rec->nr_threads = 0;
+
+ return 0;
+}
+
int cmd_record(int argc, const char **argv)
{
int err;
@@ -2821,6 +2930,12 @@ int cmd_record(int argc, const char **argv)
goto out;
}
+ err = record__init_thread_masks(rec);
+ if (err) {
+ pr_err("record__init_thread_masks failed, error %d\n", err);
+ goto out;
+ }
+
if (rec->opts.nr_cblocks > nr_cblocks_max)
rec->opts.nr_cblocks = nr_cblocks_max;
pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
@@ -2839,6 +2954,7 @@ int cmd_record(int argc, const char **argv)
symbol__exit();
auxtrace_record__free(rec->itr);
out_opts:
+ record__fini_thread_masks(rec);
evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
return err;
}
--
2.24.1
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