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s390/pai_ext: split function paiext_push_sample

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Split function paiext_push_sample() into two parts. The first part
determines the number of bytes to store as raw data in the perf sample
record. This is now function paiext_have_sample().
The second part stores the raw data in the perf event's ring buffer.
No functional change.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Thomas Richter 2023-11-16 12:12:12 +01:00 committed by Alexander Gordeev
parent 0dade41d16
commit 3046a10911
1 changed files with 20 additions and 10 deletions
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30
arch/s390/kernel/perf_pai_ext.c
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@ -415,21 +415,14 @@ static size_t paiext_copy(struct pai_userdata *userdata, unsigned long *area)
* sched_task() callback. That callback is not active after paiext_del() * sched_task() callback. That callback is not active after paiext_del()
* returns and has deleted the event on that CPU. * returns and has deleted the event on that CPU.
*/ */
static int paiext_push_sample(void) static int paiext_push_sample(size_t rawsize, struct paiext_map *cpump,
struct perf_event *event)
{ {
struct paiext_mapptr *mp = this_cpu_ptr(paiext_root.mapptr);
struct paiext_map *cpump = mp->mapptr;
struct perf_event *event = cpump->event;
struct perf_sample_data data; struct perf_sample_data data;
struct perf_raw_record raw; struct perf_raw_record raw;
struct pt_regs regs; struct pt_regs regs;
size_t rawsize;
int overflow; int overflow;
rawsize = paiext_copy(cpump->save, cpump->area);
if (!rawsize) /* No incremented counters */
return 0;
/* Setup perf sample */ /* Setup perf sample */
memset(&regs, 0, sizeof(regs)); memset(&regs, 0, sizeof(regs));
memset(&raw, 0, sizeof(raw)); memset(&raw, 0, sizeof(raw));
@ -458,6 +451,23 @@ static int paiext_push_sample(void)
return overflow; return overflow;
} }
/* Check if there is data to be saved on schedule out of a task. */
static int paiext_have_sample(void)
{
struct paiext_mapptr *mp = this_cpu_ptr(paiext_root.mapptr);
struct paiext_map *cpump = mp->mapptr;
struct perf_event *event = cpump->event;
size_t rawsize;
int rc = 0;
if (!event)
return 0;
rawsize = paiext_copy(cpump->save, cpump->area);
if (rawsize) /* Incremented counters */
rc = paiext_push_sample(rawsize, cpump, event);
return rc;
}
/* Called on schedule-in and schedule-out. No access to event structure, /* Called on schedule-in and schedule-out. No access to event structure,
* but for sampling only event NNPA_ALL is allowed. * but for sampling only event NNPA_ALL is allowed.
*/ */
@ -467,7 +477,7 @@ static void paiext_sched_task(struct perf_event_pmu_context *pmu_ctx, bool sched
* results on schedule_out and if page was dirty, clear values. * results on schedule_out and if page was dirty, clear values.
*/ */
if (!sched_in) if (!sched_in)
paiext_push_sample(); paiext_have_sample();
} }
/* Attribute definitions for pai extension1 interface. As with other CPU /* Attribute definitions for pai extension1 interface. As with other CPU