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perf tools: Handle kernels that don't support attr.exclude_{guest,host}

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Just fall back to resetting those fields, if set, warning the user that
that feature is not available.

If guest samples appear they will just be discarded because no struct
machine will be found and thus the event will be accounted as not
handled and dropped, see 0c09571.

Reported-by: Namhyung Kim <namhyung@gmail.com>
Tested-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-vuwxig36mzprl5n7nzvnxxsh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2012-02-14 14:05:30 -02:00
parent 8f54ed4a2d
commit bc76efe645
4 changed files with 38 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
tools/perf/builtin-record.c
View file

@ -204,6 +204,9 @@ static void perf_record__open(struct perf_record *rec)
if (opts->group && pos != first)
group_fd = first->fd;
fallback_missing_features:
if (opts->exclude_guest_missing)
attr->exclude_guest = attr->exclude_host = 0;
retry_sample_id:
attr->sample_id_all = opts->sample_id_all_avail ? 1 : 0;
try_again:
@ -217,15 +220,23 @@ static void perf_record__open(struct perf_record *rec)
} else if (err == ENODEV && opts->cpu_list) {
die("No such device - did you specify"
" an out-of-range profile CPU?\n");
} else if (err == EINVAL && opts->sample_id_all_avail) {
/*
* Old kernel, no attr->sample_id_type_all field
*/
opts->sample_id_all_avail = false;
if (!opts->sample_time && !opts->raw_samples && !time_needed)
attr->sample_type &= ~PERF_SAMPLE_TIME;
} else if (err == EINVAL) {
if (!opts->exclude_guest_missing &&
(attr->exclude_guest || attr->exclude_host)) {
pr_debug("Old kernel, cannot exclude "
"guest or host samples.\n");
opts->exclude_guest_missing = true;
goto fallback_missing_features;
} else if (opts->sample_id_all_avail) {
/*
* Old kernel, no attr->sample_id_type_all field
*/
opts->sample_id_all_avail = false;
if (!opts->sample_time && !opts->raw_samples && !time_needed)
attr->sample_type &= ~PERF_SAMPLE_TIME;
goto retry_sample_id;
goto retry_sample_id;
}
}
/*

23
tools/perf/builtin-top.c
View file

@ -857,6 +857,9 @@ static void perf_top__start_counters(struct perf_top *top)
attr->mmap = 1;
attr->comm = 1;
attr->inherit = top->inherit;
fallback_missing_features:
if (top->exclude_guest_missing)
attr->exclude_guest = attr->exclude_host = 0;
retry_sample_id:
attr->sample_id_all = top->sample_id_all_avail ? 1 : 0;
try_again:
@ -868,12 +871,20 @@ static void perf_top__start_counters(struct perf_top *top)
if (err == EPERM || err == EACCES) {
ui__error_paranoid();
goto out_err;
} else if (err == EINVAL && top->sample_id_all_avail) {
/*
* Old kernel, no attr->sample_id_type_all field
*/
top->sample_id_all_avail = false;
goto retry_sample_id;
} else if (err == EINVAL) {
if (!top->exclude_guest_missing &&
(attr->exclude_guest || attr->exclude_host)) {
pr_debug("Old kernel, cannot exclude "
"guest or host samples.\n");
top->exclude_guest_missing = true;
goto fallback_missing_features;
} else if (top->sample_id_all_avail) {
/*
* Old kernel, no attr->sample_id_type_all field
*/
top->sample_id_all_avail = false;
goto retry_sample_id;
}
}
/*
* If it's cycles then fall back to hrtimer

1
tools/perf/perf.h
View file

@ -199,6 +199,7 @@ struct perf_record_opts {
bool sample_address;
bool sample_time;
bool sample_id_all_avail;
bool exclude_guest_missing;
bool system_wide;
bool period;
unsigned int freq;

1
tools/perf/util/top.h
View file

@ -34,6 +34,7 @@ struct perf_top {
bool inherit;
bool group;
bool sample_id_all_avail;
bool exclude_guest_missing;
bool dump_symtab;
const char *cpu_list;
struct hist_entry *sym_filter_entry;