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psi: Introduce ftrace events

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Add ftrace events to capture per-zone memory stats when a
trigger threshold is hit.

Change-Id: Ic52a27713acd34090c8f99543408b277877015c7
Signed-off-by: Patrick Daly <[email protected]>
This commit is contained in:
Patrick Daly 2019-04-04 18:55:51 -07:00 • committed by Isaac J. Manjarres
commit 76cf078de1
3 changed files with 113 additions and 0 deletions
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33
kernel/sched/psi.c
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@ -142,6 +142,9 @@
#include <linux/psi.h>
#include "sched.h"
#define CREATE_TRACE_POINTS
#include <trace/events/psi.h>
static int psi_bug __read_mostly;
DEFINE_STATIC_KEY_FALSE(psi_disabled);
@ -441,6 +444,33 @@ static void psi_avgs_work(struct work_struct *work)
mutex_unlock(&group->avgs_lock);
}
#ifdef CONFIG_PSI_FTRACE
static void trace_event_helper(struct psi_group *group)
{
struct zone *zone;
unsigned long wmark;
unsigned long free;
unsigned long cma;
unsigned long file;
u64 memstall = group->total[PSI_POLL][PSI_MEM_SOME];
for_each_populated_zone(zone) {
wmark = zone->watermark[WMARK_HIGH];
free = zone_page_state(zone, NR_FREE_PAGES);
cma = zone_page_state(zone, NR_FREE_CMA_PAGES);
file = zone_page_state(zone, NR_ZONE_ACTIVE_FILE) +
zone_page_state(zone, NR_ZONE_INACTIVE_FILE);
trace_psi_window_vmstat(
memstall, zone->name, wmark, free, cma, file);
}
}
#else
static void trace_event_helper(struct psi_group *group)
{
}
#endif /* CONFIG_PSI_FTRACE */
/* Trigger tracking window manupulations */
static void window_reset(struct psi_window *win, u64 now, u64 value,
u64 prev_growth)
@ -533,6 +563,8 @@ static u64 update_triggers(struct psi_group *group, u64 now)
if (now < t->last_event_time + t->win.size)
continue;
trace_psi_event(t->state, t->threshold);
/* Generate an event */
if (cmpxchg(&t->event, 0, 1) == 0)
wake_up_interruptible(&t->event_wait);
@ -605,6 +637,7 @@ static void psi_poll_work(struct kthread_work *work)
*/
group->polling_until = now +
group->poll_min_period * UPDATES_PER_WINDOW;
trace_event_helper(group);
}
if (now > group->polling_until) {