[PATCH v4 01/12] perf record: introduce thread affinity and mmap masks

[Bayduraev, Alexey V]

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 Bayduraev <alexey.v.baydur...@linux.intel.com>
---
 tools/perf/builtin-record.c | 117 ++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 35465d1db6dd..e0cbf05d255c 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;
@@ -109,6 +114,8 @@ 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;
@@ -2176,6 +2183,45 @@ 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)
 {
@@ -2611,6 +2657,70 @@ 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;
+
+       if (rec->thread_masks)
+               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;
@@ -2844,6 +2954,12 @@ 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);
@@ -2862,6 +2978,7 @@ 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;
 }
-- 
2.19.0