Commit d6f962b5 authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

perf: Export software-only event group characteristic as a flag

Before scheduling an event group, we first check if a group can go
on. We first check if the group is made of software only events
first, in which case it is enough to know if the group can be
scheduled in.

For that purpose, we iterate through the whole group, which is
wasteful as we could do this check when we add/delete an event to
a group.

So we create a group_flags field in perf event that can host
characteristics from a group of events, starting with a first
PERF_GROUP_SOFTWARE flag that reduces the check on the fast path.
Signed-off-by: default avatarFrederic Weisbecker <>
Acked-by: default avatarPeter Zijlstra <>
Cc: Paul Mackerras <>
Cc: Ingo Molnar <>
Cc: Arnaldo Carvalho de Melo <>
parent e2864173
......@@ -565,6 +565,10 @@ typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
struct perf_sample_data *,
struct pt_regs *regs);
enum perf_group_flag {
* struct perf_event - performance event kernel representation:
......@@ -574,6 +578,7 @@ struct perf_event {
struct list_head event_entry;
struct list_head sibling_list;
int nr_siblings;
int group_flags;
struct perf_event *group_leader;
struct perf_event *output;
const struct pmu *pmu;
......@@ -315,9 +315,16 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
if (group_leader == event) {
struct list_head *list;
if (is_software_event(event))
event->group_flags |= PERF_GROUP_SOFTWARE;
list = ctx_group_list(event, ctx);
list_add_tail(&event->group_entry, list);
} else {
if (group_leader->group_flags & PERF_GROUP_SOFTWARE &&
group_leader->group_flags &= ~PERF_GROUP_SOFTWARE;
list_add_tail(&event->group_entry, &group_leader->sibling_list);
......@@ -372,6 +379,9 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
list = ctx_group_list(event, ctx);
list_move_tail(&sibling->group_entry, list);
sibling->group_leader = sibling;
/* Inherit group flags from the previous leader */
sibling->group_flags = event->group_flags;
......@@ -699,24 +709,6 @@ group_sched_in(struct perf_event *group_event,
return -EAGAIN;
* Return 1 for a group consisting entirely of software events,
* 0 if the group contains any hardware events.
static int is_software_only_group(struct perf_event *leader)
struct perf_event *event;
if (!is_software_event(leader))
return 0;
list_for_each_entry(event, &leader->sibling_list, group_entry)
if (!is_software_event(event))
return 0;
return 1;
* Work out whether we can put this event group on the CPU now.
......@@ -727,7 +719,7 @@ static int group_can_go_on(struct perf_event *event,
* Groups consisting entirely of software events can always go on.
if (is_software_only_group(event))
if (event->group_flags & PERF_GROUP_SOFTWARE)
return 1;
* If an exclusive group is already on, no other hardware
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