diff options
Diffstat (limited to 'tools/perf/util/expr.c')
| -rw-r--r-- | tools/perf/util/expr.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c index d46a1878bc9e..bb6ddad7e021 100644 --- a/tools/perf/util/expr.c +++ b/tools/perf/util/expr.c @@ -14,6 +14,7 @@ #include "util/hashmap.h" #include "smt.h" #include "tsc.h" +#include <api/fs/fs.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/zalloc.h> @@ -400,6 +401,20 @@ double arch_get_tsc_freq(void) } #endif +static double has_pmem(void) +{ + static bool has_pmem, cached; + const char *sysfs = sysfs__mountpoint(); + char path[PATH_MAX]; + + if (!cached) { + snprintf(path, sizeof(path), "%s/firmware/acpi/tables/NFIT", sysfs); + has_pmem = access(path, F_OK) == 0; + cached = true; + } + return has_pmem ? 1.0 : 0.0; +} + double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx) { const struct cpu_topology *topology; @@ -449,6 +464,10 @@ double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx result = perf_pmu__cpu_slots_per_cycle(); goto out; } + if (!strcmp("#has_pmem", literal)) { + result = has_pmem(); + goto out; + } pr_err("Unrecognized literal '%s'", literal); out: |