perf tools: Add time out to force stop proc map processing

[deliverable/linux.git] / tools / perf / util / event.c

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 793b1503d437b4fd2e321d664625d004a0bb3410..416ba80c628fda9d76d1828cba63dbed8d1d45da 100644 (file)
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -213,6 +213,8 @@ static int perf_event__synthesize_fork(struct perf_tool *tool,
        return 0;
 }
 
+#define PROC_MAP_PARSE_TIMEOUT (500 * 1000000ULL)
+
 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
                                       union perf_event *event,
                                       pid_t pid, pid_t tgid,
@@ -222,6 +224,8 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 {
        char filename[PATH_MAX];
        FILE *fp;
+       unsigned long long t;
+       bool truncation = false;
        int rc = 0;
 
        if (machine__is_default_guest(machine))
@@ -240,6 +244,7 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
        }
 
        event->header.type = PERF_RECORD_MMAP2;
+       t = rdclock();
 
        while (1) {
                char bf[BUFSIZ];
@@ -253,6 +258,12 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
                if (fgets(bf, sizeof(bf), fp) == NULL)
                        break;
 
+               if ((rdclock() - t) > PROC_MAP_PARSE_TIMEOUT) {
+                       pr_warning("Reading %s time out.\n", filename);
+                       truncation = true;
+                       goto out;
+               }
+
                /* ensure null termination since stack will be reused. */
                strcpy(execname, "");
 
@@ -301,6 +312,10 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
                        event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
                }
 
+out:
+               if (truncation)
+                       event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
+
                if (!strcmp(execname, ""))
                        strcpy(execname, anonstr);
 
@@ -319,6 +334,9 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
                        rc = -1;
                        break;
                }
+
+               if (truncation)
+                       break;
        }
 
        fclose(fp);