perf tools: Add possibility to specify mmap size

[mirror_ubuntu-bionic-kernel.git] / tools / perf / util / evlist.c

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 4283f49ca0ab9dc03b37cb2809c20d06a5678bc6..d21ab08129264c10859133e6b1da7bce444e4608 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -687,14 +687,33 @@ static size_t perf_evlist__mmap_size(unsigned long pages)
 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
                                  int unset __maybe_unused)
 {
-       unsigned int pages, *mmap_pages = opt->value;
+       unsigned int pages, val, *mmap_pages = opt->value;
        size_t size;
-       char *eptr;
+       static struct parse_tag tags[] = {
+               { .tag  = 'B', .mult = 1       },
+               { .tag  = 'K', .mult = 1 << 10 },
+               { .tag  = 'M', .mult = 1 << 20 },
+               { .tag  = 'G', .mult = 1 << 30 },
+               { .tag  = 0 },
+       };
 
-       pages = strtoul(str, &eptr, 10);
-       if (*eptr != '\0') {
-               pr_err("failed to parse --mmap_pages/-m value\n");
-               return -1;
+       val = parse_tag_value(str, tags);
+       if (val != (unsigned int) -1) {
+               /* we got file size value */
+               pages = PERF_ALIGN(val, page_size) / page_size;
+               if (!is_power_of_2(pages)) {
+                       pages = next_pow2(pages);
+                       pr_info("rounding mmap pages size to %u (%u pages)\n",
+                               pages * page_size, pages);
+               }
+       } else {
+               /* we got pages count value */
+               char *eptr;
+               pages = strtoul(str, &eptr, 10);
+               if (*eptr != '\0') {
+                       pr_err("failed to parse --mmap_pages/-m value\n");
+                       return -1;
+               }
        }
 
        size = perf_evlist__mmap_size(pages);
@@ -738,6 +757,7 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 
        evlist->overwrite = overwrite;
        evlist->mmap_len = perf_evlist__mmap_size(pages);
+       pr_debug("mmap size %luB\n", evlist->mmap_len);
        mask = evlist->mmap_len - page_size - 1;
 
        list_for_each_entry(evsel, &evlist->entries, node) {