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authorYunlong Song <yunlong.song@huawei.com>2015-04-02 21:47:18 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-04-02 13:18:51 -0300
commite366a6d8949f3cfab01906b42c591098d59f3f35 (patch)
treef6fd5c9cad1ae9cc91ed80ccddf33fcce673e7e8 /tools/perf/builtin-trace.c
parent44f7e432e3dc8a13f5661e8b722f53645df083d1 (diff)
downloadlinux-e366a6d8949f3cfab01906b42c591098d59f3f35.tar.gz
perf trace: Support using -f to override perf.data file ownership
Enable perf trace to use perf.data when it is not owned by current user or root. Example: # perf trace record ls # chown Yunlong.Song:Yunlong.Song perf.data # ls -al perf.data -rw------- 1 Yunlong.Song Yunlong.Song 4153101 Apr 2 15:28 perf.data # id uid=0(root) gid=0(root) groups=0(root),64(pkcs11) Before this patch: # perf trace -i perf.data File perf.data not owned by current user or root (use -f to override) # perf trace -i perf.data -f Error: unknown switch `f' usage: perf trace [<options>] [<command>] or: perf trace [<options>] -- <command> [<options>] or: perf trace record [<options>] [<command>] or: perf trace record [<options>] -- <command> [<options>] --event <event> event selector. use 'perf list' to list available events --comm show the thread COMM next to its id --tool_stats show tool stats -e, --expr <expr> list of events to trace -o, --output <file> output file name -i, --input <file> Analyze events in file -p, --pid <pid> trace events on existing process id -t, --tid <tid> trace events on existing thread id --filter-pids <float> ... As shown above, the -f option does not work at all. After this patch: # perf trace -i perf.data File perf.data not owned by current user or root (use -f to override) # perf trace -i perf.data -f 0.056 ( 0.002 ms): ls/47325 brk( ... 0.108 ( 0.018 ms): ls/47325 mmap(len: 4096, prot: READ|WRITE, ... 0.145 ( 0.013 ms): ls/47325 access(filename: 0x7f31259a0eb0, ... 0.172 ( 0.008 ms): ls/47325 open(filename: 0x7fffeb9a0d00, ... 0.180 ( 0.004 ms): ls/47325 stat(filename: 0x7fffeb9a0d00, ... 0.185 ( 0.004 ms): ls/47325 open(filename: 0x7fffeb9a0d00, ... 0.189 ( 0.003 ms): ls/47325 stat(filename: 0x7fffeb9a0d00, ... 0.195 ( 0.004 ms): ls/47325 open(filename: 0x7fffeb9a0d00, ... 0.199 ( 0.002 ms): ls/47325 stat(filename: 0x7fffeb9a0d00, ... 0.205 ( 0.004 ms): ls/47325 open(filename: 0x7fffeb9a0d00, ... 0.211 ( 0.004 ms): ls/47325 stat(filename: 0x7fffeb9a0d00, ... 0.220 ( 0.007 ms): ls/47325 open(filename: 0x7f312599e8ff, ... ... ... As shown above, the -f option really works now. Signed-off-by: Yunlong Song <yunlong.song@huawei.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1427982439-27388-10-git-send-email-yunlong.song@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-trace.c')
-rw-r--r--tools/perf/builtin-trace.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index bcc98ce3e5b8..e124741be187 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1254,6 +1254,7 @@ struct trace {
bool show_comm;
bool show_tool_stats;
bool trace_syscalls;
+ bool force;
int trace_pgfaults;
};
@@ -2345,6 +2346,7 @@ static int trace__replay(struct trace *trace)
struct perf_data_file file = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
+ .force = trace->force,
};
struct perf_session *session;
struct perf_evsel *evsel;
@@ -2693,6 +2695,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",
"Trace pagefaults", parse_pagefaults, "maj"),
OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),
+ OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"),
OPT_END()
};
const char * const trace_subcommands[] = { "record", NULL };