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authorMichael Petlan2020-01-14 11:42:36 +0100
committerArnaldo Carvalho de Melo2020-01-15 10:17:20 -0300
commit8af19d66b956401bab1ef24049eec9421be93862 (patch)
tree96b45e3cdf89cdf2d746870030bd9d5460d6b590 /tools/perf
parentc1c8013ec34d7163431d18367808ea40b2e305f8 (diff)
perf header: Use last modification time for timestamp
Using .st_ctime clobbers the timestamp information in perf report header whenever any operation is done with the file. Even tar-ing and untar-ing the perf.data file (which preserves the file last modification timestamp) doesn't prevent that: [Michael@Diego tmp]$ ls -l perf.data -> -rw-------. 1 Michael Michael 169888 Dec 2 15:23 perf.data [Michael@Diego tmp]$ perf report --header-only # ======== -> # captured on : Mon Dec 2 15:23:42 2019 [...] [Michael@Diego tmp]$ tar c perf.data | xz > perf.data.tar.xz [Michael@Diego tmp]$ mkdir aaa [Michael@Diego tmp]$ cd aaa [Michael@Diego aaa]$ xzcat ../perf.data.tar.xz | tar x [Michael@Diego aaa]$ ls -l -a total 172 drwxrwxr-x. 2 Michael Michael 23 Jan 14 11:26 . drwxrwxr-x. 6 Michael Michael 4096 Jan 14 11:26 .. -> -rw-------. 1 Michael Michael 169888 Dec 2 15:23 perf.data [Michael@Diego aaa]$ perf report --header-only # ======== -> # captured on : Tue Jan 14 11:26:16 2020 [...] When using .st_mtime instead, correct information is printed: [Michael@Diego aaa]$ ~/acme/tools/perf/perf report --header-only # ======== -> # captured on : Mon Dec 2 15:23:42 2019 [...] Signed-off-by: Michael Petlan <mpetlan@redhat.com> Acked-by: Jiri Olsa <jolsa@kernel.org> LPU-Reference: 20200114104236.31555-1-mpetlan@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/header.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 93ad27830e2b..4246e7447e54 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2922,7 +2922,7 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
if (ret == -1)
return -1;
- stctime = st.st_ctime;
+ stctime = st.st_mtime;
fprintf(fp, "# captured on : %s", ctime(&stctime));
fprintf(fp, "# header version : %u\n", header->version);