[tip:perf/core] perf record: Fix use of sample_id_all userspace with !sample_id_all kernels

tip-bot for Arnaldo Carvalho de Melo
2011-01-04T08:19:59Z

Commit-ID: a43d3f08c64125edbdfdc3d3aa512d3e37321f37
Gitweb: http://git.kernel.org/tip/a43d3f08c64125edbdfdc3d3aa512d3e37321f37
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Sat, 25 Dec 2010 12:12:25 -0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Sat, 25 Dec 2010 12:12:25 -0200

perf record: Fix use of sample_id_all userspace with !sample_id_all kernels

Check if parse_single_tracepoint_event has already asked for PERF_SAMPLE_TIME.

This is kludgy but short term fix for problems introduced by eac23d1c that
broke 'perf script' by having different sample_types when using multiple
tracepoint events when we use a perf binary that tries to use sample_id_all on
an older kernel.

We need to move counter creation to perf_session, support different
sample_types, etc.

Ongoing work on the perf test infrastructure needs this so that we can create
counters to monitor threads generating specific events, etc.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Torok Edwin <edwintorok@gmail.com>
Cc: Ian Munsie <imunsie@au1.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-record.c | 24 +++++++++++++++++++-----
1 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5149e3d..50efbd5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -243,6 +243,19 @@ static void create_counter(int counter, int cpu)
u64 time_running;
u64 id;
} read_data;
+ /*
+ * Check if parse_single_tracepoint_event has already asked for
+ * PERF_SAMPLE_TIME.
+ *
+ * XXX this is kludgy but short term fix for problems introduced by
+ * eac23d1c that broke 'perf script' by having different sample_types
+ * when using multiple tracepoint events when we use a perf binary
+ * that tries to use sample_id_all on an older kernel.
+ *
+ * We need to move counter creation to perf_session, support
+ * different sample_types, etc.
+ */
+ bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;

attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
PERF_FORMAT_TOTAL_TIME_RUNNING |
@@ -285,7 +298,8 @@ static void create_counter(int counter, int cpu)
if (system_wide)
attr->sample_type |= PERF_SAMPLE_CPU;

- if (sample_time || system_wide || !no_inherit || cpu_list)
+ if (sample_id_all_avail &&
+ (sample_time || system_wide || !no_inherit || cpu_list))
attr->sample_type |= PERF_SAMPLE_TIME;

if (raw_samples) {
@@ -294,9 +308,6 @@ static void create_counter(int counter, int cpu)
attr->sample_type |= PERF_SAMPLE_CPU;
}

- if (!sample_type)
- sample_type = attr->sample_type;
-
attr->mmap = track;
attr->comm = track;
attr->inherit = !no_inherit;
@@ -327,7 +338,7 @@ try_again:
* Old kernel, no attr->sample_id_type_all field
*/
sample_id_all_avail = false;
- if (!sample_time && !raw_samples)
+ if (!sample_time && !raw_samples && !time_needed)
attr->sample_type &= ~PERF_SAMPLE_TIME;

goto retry_sample_id;
@@ -428,6 +439,9 @@ try_again:
}
}
}
+
+ if (!sample_type)
+ sample_type = attr->sample_type;
}

static void open_counters(int cpu)