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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
commit863981e96738983919de841ec669e157e6bdaeb0 (patch)
treed6d89a12e7eb8017837c057935a2271290907f76 /tools/perf/jvmti
parent8dec7c70575785729a6a9e6719a955e9c545bcab (diff)
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'tools/perf/jvmti')
-rw-r--r--tools/perf/jvmti/jvmti_agent.c43
1 files changed, 41 insertions, 2 deletions
diff --git a/tools/perf/jvmti/jvmti_agent.c b/tools/perf/jvmti/jvmti_agent.c
index 6461e02ab..3573f315f 100644
--- a/tools/perf/jvmti/jvmti_agent.c
+++ b/tools/perf/jvmti/jvmti_agent.c
@@ -92,6 +92,22 @@ error:
return ret;
}
+static int use_arch_timestamp;
+
+static inline uint64_t
+get_arch_timestamp(void)
+{
+#if defined(__i386__) || defined(__x86_64__)
+ unsigned int low, high;
+
+ asm volatile("rdtsc" : "=a" (low), "=d" (high));
+
+ return low | ((uint64_t)high) << 32;
+#else
+ return 0;
+#endif
+}
+
#define NSEC_PER_SEC 1000000000
static int perf_clk_id = CLOCK_MONOTONIC;
@@ -107,6 +123,9 @@ perf_get_timestamp(void)
struct timespec ts;
int ret;
+ if (use_arch_timestamp)
+ return get_arch_timestamp();
+
ret = clock_gettime(perf_clk_id, &ts);
if (ret)
return 0;
@@ -203,6 +222,17 @@ perf_close_marker_file(void)
munmap(marker_addr, pgsz);
}
+static void
+init_arch_timestamp(void)
+{
+ char *str = getenv("JITDUMP_USE_ARCH_TIMESTAMP");
+
+ if (!str || !*str || !strcmp(str, "0"))
+ return;
+
+ use_arch_timestamp = 1;
+}
+
void *jvmti_open(void)
{
int pad_cnt;
@@ -211,11 +241,17 @@ void *jvmti_open(void)
int fd;
FILE *fp;
+ init_arch_timestamp();
+
/*
* check if clockid is supported
*/
- if (!perf_get_timestamp())
- warnx("jvmti: kernel does not support %d clock id", perf_clk_id);
+ if (!perf_get_timestamp()) {
+ if (use_arch_timestamp)
+ warnx("jvmti: arch timestamp not supported");
+ else
+ warnx("jvmti: kernel does not support %d clock id", perf_clk_id);
+ }
memset(&header, 0, sizeof(header));
@@ -263,6 +299,9 @@ void *jvmti_open(void)
header.timestamp = perf_get_timestamp();
+ if (use_arch_timestamp)
+ header.flags |= JITDUMP_FLAGS_ARCH_TIMESTAMP;
+
if (!fwrite(&header, sizeof(header), 1, fp)) {
warn("jvmti: cannot write dumpfile header");
goto error;