diff options
| author | Yunlong Song <yunlong.song@huawei.com> | 2015-04-02 16:47:13 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-04-02 19:18:47 +0300 |
| commit | 8cc5ec1f754355ed788838390e86389c9ffb7590 (patch) | |
| tree | eb7bff5803b6684b2c12574f16e7bc133bb27cd6 /tools/perf/builtin-kvm.c | |
| parent | d1eeb77c1811fd178442ccb8f58004a19ec40dd3 (diff) | |
| download | linux-8cc5ec1f754355ed788838390e86389c9ffb7590.tar.xz | |
perf kvm: Support using -f to override perf.data.guest file ownership
Enable perf kvm to use perf.data.guest when it is not owned by current
user or root.
Example:
# perf kvm stat record ls
# chown Yunlong.Song:Yunlong.Song perf.data.guest
# ls -al perf.data.guest
-rw------- 1 Yunlong.Song Yunlong.Song 4128937 Apr 2 11:05 perf.data.guest
# id
uid=0(root) gid=0(root) groups=0(root),64(pkcs11)
Before this patch:
# perf kvm stat report
File perf.data.guest not owned by current user or root (use -f to override)
Initializing perf session failed
# perf kvm stat report -f
Error: unknown switch `f'
usage: perf kvm stat report [<options>]
--event <report event>
event for reporting: vmexit, mmio (x86 only),
ioport (x86 only)
--vcpu <n> vcpu id to report
-k, --key <sort-key> key for sorting: sample(sort by samples
number) time (sort by avg time)
-p, --pid <pid> analyze events only for given process id(s)
As shown above, the -f option does not work at all.
After this patch:
# perf kvm stat report
File perf.data.guest not owned by current user or root (use -f to override)
Initializing perf session failed
# perf kvm stat report -f
Analyze events for all VMs, all VCPUs:
VM-EXIT Samples Samples% Time% Min Time Max Time Avg time
Total Samples:0, Total events handled time:0.00us.
As shown above, the -f option really works now. Since we have not
launched any KVM related process, the result shows 0 sample here.
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/1427982439-27388-5-git-send-email-yunlong.song@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-kvm.c')
| -rw-r--r-- | tools/perf/builtin-kvm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index 643722f40075..1f9338f6109c 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -1047,6 +1047,7 @@ static int read_events(struct perf_kvm_stat *kvm) struct perf_data_file file = { .path = kvm->file_name, .mode = PERF_DATA_MODE_READ, + .force = kvm->force, }; kvm->tool = eops; @@ -1204,6 +1205,7 @@ kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv) " time (sort by avg time)"), OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid", "analyze events only for given process id(s)"), + OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"), OPT_END() }; |