add per class compact trace event. It will show how many zs pages
isolated, how many zs pages reclaimed.
----
<...>-627 [002] .... 192.641122: zs_compact_start: pool zram0
<...>-627 [002] .... 192.641166: zs_compact_class: class 254: 0 zspage
isolated, 0 reclaimed
<...>-627 [002] .... 192.641169: zs_compact_class: class 202: 0 zspage
isolated, 0 reclaimed
<...>-627 [002] .... 192.641172: zs_compact_class: class 190: 0 zspage
isolated, 0 reclaimed
<...>-627 [002] .... 192.641180: zs_compact_class: class 168: 3 zspage
isolated, 1 reclaimed
<...>-627 [002] .... 192.641190: zs_compact_class: class 151: 3 zspage
isolated, 1 reclaimed
<...>-627 [002] .... 192.641201: zs_compact_class: class 144: 6 zspage
isolated, 1 reclaimed
<...>-627 [002] .... 192.641224: zs_compact_class: class 126: 24 zspage
isolated, 12 reclaimed
<...>-627 [002] .... 192.641261: zs_compact_class: class 111: 10 zspage
isolated, 2 reclaimed
kswapd0-627 [002] .... 192.641333: zs_compact_class: class 107: 38 zspage
isolated, 8 reclaimed
kswapd0-627 [002] .... 192.641415: zs_compact_class: class 100: 45 zspage
isolated, 12 reclaimed
kswapd0-627 [002] .... 192.641481: zs_compact_class: class 94: 24 zspage
isolated, 5 reclaimed
kswapd0-627 [002] .... 192.641568: zs_compact_class: class 91: 69 zspage
isolated, 14 reclaimed
kswapd0-627 [002] .... 192.641688: zs_compact_class: class 83: 120 zspage
isolated, 47 reclaimed
kswapd0-627 [002] .... 192.641765: zs_compact_class: class 76: 34 zspage
isolated, 5 reclaimed
kswapd0-627 [002] .... 192.641832: zs_compact_class: class 74: 34 zspage
isolated, 6 reclaimed
kswapd0-627 [002] .... 192.641958: zs_compact_class: class 71: 66 zspage
isolated, 17 reclaimed
kswapd0-627 [002] .... 192.642000: zs_compact_class: class 67: 17 zspage
isolated, 3 reclaimed
kswapd0-627 [002] .... 192.642063: zs_compact_class: class 66: 29 zspage
isolated, 5 reclaimed
kswapd0-627 [002] .... 192.642113: zs_compact_class: class 62: 38 zspage
isolated, 12 reclaimed
kswapd0-627 [002] .... 192.642143: zs_compact_class: class 58: 8 zspage
isolated, 1 reclaimed
kswapd0-627 [002] .... 192.642176: zs_compact_class: class 57: 25 zspage
isolated, 5 reclaimed
kswapd0-627 [002] .... 192.642184: zs_compact_class: class 54: 11 zspage
isolated, 2 reclaimed
kswapd0-627 [002] .... 192.642191: zs_compact_class: class 52: 5 zspage
isolated, 1 reclaimed
kswapd0-627 [002] .... 192.642201: zs_compact_class: class 51: 6 zspage
isolated, 1 reclaimed
kswapd0-627 [002] .... 192.642211: zs_compact_class: class 49: 11 zspage
isolated, 3 reclaimed
kswapd0-627 [002] .... 192.642216: zs_compact_class: class 46: 2 zspage
isolated, 1 reclaimed
kswapd0-627 [002] .... 192.642218: zs_compact_class: class 44: 0 zspage
isolated, 0 reclaimed
kswapd0-627 [002] .... 192.642221: zs_compact_class: class 43: 0 zspage
isolated, 0 reclaimed
...
----
Signed-off-by: Ganesh Mahendran <opensource.gan...@gmail.com>
---
include/trace/events/zsmalloc.h | 24 ++++++++++++++++++++++++
mm/zsmalloc.c | 16 +++++++++++++++-
2 files changed, 39 insertions(+), 1 deletion(-)
diff --git a/include/trace/events/zsmalloc.h b/include/trace/events/zsmalloc.h
index c7a39f4..e745246 100644
--- a/include/trace/events/zsmalloc.h
+++ b/include/trace/events/zsmalloc.h
@@ -46,6 +46,30 @@ TRACE_EVENT(zs_compact_end,
__entry->pages_compacted)
);
+TRACE_EVENT(zs_compact_class,
+
+ TP_PROTO(int class, unsigned long zspage_isolated, unsigned long
zspage_reclaimed),
+
+ TP_ARGS(class, zspage_isolated, zspage_reclaimed),
+
+ TP_STRUCT__entry(
+ __field(int, class)
+ __field(unsigned long, zspage_isolated)
+ __field(unsigned long, zspage_reclaimed)
+ ),
+
+ TP_fast_assign(
+ __entry->class = class;
+ __entry->zspage_isolated = zspage_isolated;
+ __entry->zspage_reclaimed = zspage_reclaimed;
+ ),
+
+ TP_printk("class %3d: %ld zspage isolated, %ld zspage reclaimed",
+ __entry->class,
+ __entry->zspage_isolated,
+ __entry->zspage_reclaimed)
+);
+
#endif /* _TRACE_ZSMALLOC_H */
/* This part must be outside protection */
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index c7f79d5..405baa5 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1780,6 +1780,11 @@ struct zs_compact_control {
/* Starting object index within @s_page which used for live object
* in the subpage. */
int index;
+
+ /* zspage isolated */
+ unsigned long nr_isolated;
+ /* zspage reclaimed */
+ unsigned long nr_reclaimed;
};
static int migrate_zspage(struct zs_pool *pool, struct size_class *class,
@@ -2272,7 +2277,10 @@ static unsigned long zs_can_compact(struct size_class
*class)
static void __zs_compact(struct zs_pool *pool, struct size_class *class)
{
- struct zs_compact_control cc;
+ struct zs_compact_control cc = {
+ .nr_isolated = 0,
+ .nr_reclaimed = 0,
+ };
struct zspage *src_zspage;
struct zspage *dst_zspage = NULL;
@@ -2282,10 +2290,13 @@ static void __zs_compact(struct zs_pool *pool, struct
size_class *class)
if (!zs_can_compact(class))
break;
+ cc.nr_isolated++;
+
cc.index = 0;
cc.s_page = get_first_page(src_zspage);
while ((dst_zspage = isolate_zspage(class, false))) {
+ cc.nr_isolated++;
cc.d_page = get_first_page(dst_zspage);
/*
* If there is no more space in dst_page, resched
@@ -2304,6 +2315,7 @@ static void __zs_compact(struct zs_pool *pool, struct
size_class *class)
putback_zspage(class, dst_zspage);
if (putback_zspage(class, src_zspage) == ZS_EMPTY) {
free_zspage(pool, class, src_zspage);
+ cc.nr_reclaimed++;
pool->stats.pages_compacted += class->pages_per_zspage;
}
spin_unlock(&class->lock);
@@ -2315,6 +2327,8 @@ static void __zs_compact(struct zs_pool *pool, struct
size_class *class)
putback_zspage(class, src_zspage);
spin_unlock(&class->lock);
+
+ trace_zs_compact_class(class->index, cc.nr_isolated, cc.nr_reclaimed);
}
unsigned long zs_compact(struct zs_pool *pool)
--
1.9.1
