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Date: Mon, 4 Jul 2016 11:12:48 +0800
From: Ganesh Mahendran <opensource.ganesh@...il.com>
To: Minchan Kim <minchan@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
akpm@...ux-foundation.org, ngupta@...are.org,
sergey.senozhatsky.work@...il.com, rostedt@...dmis.org,
mingo@...hat.com
Subject: Re: [PATCH 2/8] mm/zsmalloc: add per class compact trace event
Hi, Minchan:
On Mon, Jul 04, 2016 at 08:49:21AM +0900, Minchan Kim wrote:
> On Fri, Jul 01, 2016 at 02:41:00PM +0800, Ganesh Mahendran wrote:
> > add per class compact trace event. It will show how many zs pages
> > isolated, how many zs pages reclaimed.
>
> I don't know what you want with this event trace.
>
> What's the relation betwwen the number of zspage isolated and zspage
> reclaimed? IOW, with that, what do you want to know?
This is only for our internal debug. And it is not common for everyone.
Please ignore this patch. Sorry for the noise.
Thanks
>
> >
> > ----
> > <...>-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.ganesh@...il.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
> >
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