From: "Hillf Danton" <hillf.zj@alibaba-inc.com>
To: "'Mel Gorman'" <mgorman@techsingularity.net>,
"'Andrew Morton'" <akpm@linux-foundation.org>
Cc: "'Shantanu Goel'" <sgoel01@yahoo.com>,
"'Chris Mason'" <clm@fb.com>,
"'Johannes Weiner'" <hannes@cmpxchg.org>,
"'Vlastimil Babka'" <vbabka@suse.cz>,
"'LKML'" <linux-kernel@vger.kernel.org>,
"'Linux-MM'" <linux-mm@kvack.org>
Subject: Re: [PATCH 3/3] mm, vmscan: Prevent kswapd sleeping prematurely due to mismatched classzone_idx
Date: Thu, 16 Feb 2017 14:23:08 +0800 [thread overview]
Message-ID: <001501d2881d$242aa790$6c7ff6b0$@alibaba-inc.com> (raw)
In-Reply-To: <20170215092247.15989-4-mgorman@techsingularity.net>
On February 15, 2017 5:23 PM Mel Gorman wrote:
> */
> static int kswapd(void *p)
> {
> - unsigned int alloc_order, reclaim_order, classzone_idx;
> + unsigned int alloc_order, reclaim_order;
> + unsigned int classzone_idx = MAX_NR_ZONES - 1;
> pg_data_t *pgdat = (pg_data_t*)p;
> struct task_struct *tsk = current;
>
> @@ -3447,20 +3466,23 @@ static int kswapd(void *p)
> tsk->flags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
> set_freezable();
>
> - pgdat->kswapd_order = alloc_order = reclaim_order = 0;
> - pgdat->kswapd_classzone_idx = classzone_idx = 0;
> + pgdat->kswapd_order = 0;
> + pgdat->kswapd_classzone_idx = MAX_NR_ZONES;
> for ( ; ; ) {
> bool ret;
>
> + alloc_order = reclaim_order = pgdat->kswapd_order;
> + classzone_idx = kswapd_classzone_idx(pgdat, classzone_idx);
> +
> kswapd_try_sleep:
> kswapd_try_to_sleep(pgdat, alloc_order, reclaim_order,
> classzone_idx);
>
> /* Read the new order and classzone_idx */
> alloc_order = reclaim_order = pgdat->kswapd_order;
> - classzone_idx = pgdat->kswapd_classzone_idx;
> + classzone_idx = kswapd_classzone_idx(pgdat, 0);
> pgdat->kswapd_order = 0;
> - pgdat->kswapd_classzone_idx = 0;
> + pgdat->kswapd_classzone_idx = MAX_NR_ZONES;
>
> ret = try_to_freeze();
> if (kthread_should_stop())
> @@ -3486,9 +3508,6 @@ static int kswapd(void *p)
> reclaim_order = balance_pgdat(pgdat, alloc_order, classzone_idx);
> if (reclaim_order < alloc_order)
> goto kswapd_try_sleep;
If we fail order-5 request, can we then give up order-5, and
try order-3 if requested, after napping?
> -
> - alloc_order = reclaim_order = pgdat->kswapd_order;
> - classzone_idx = pgdat->kswapd_classzone_idx;
> }
>
next prev parent reply other threads:[~2017-02-16 6:23 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-15 9:22 [PATCH 0/3] Reduce amount of time kswapd sleeps prematurely Mel Gorman
2017-02-15 9:22 ` [PATCH 1/3] mm, vmscan: fix zone balance check in prepare_kswapd_sleep Mel Gorman
2017-02-16 2:50 ` Hillf Danton
2017-02-22 7:00 ` Minchan Kim
2017-02-23 15:05 ` Mel Gorman
2017-02-24 1:17 ` Minchan Kim
2017-02-24 9:11 ` Mel Gorman
2017-02-27 6:16 ` Minchan Kim
2017-02-15 9:22 ` [PATCH 2/3] mm, vmscan: Only clear pgdat congested/dirty/writeback state when balanced Mel Gorman
2017-02-15 9:22 ` [PATCH 3/3] mm, vmscan: Prevent kswapd sleeping prematurely due to mismatched classzone_idx Mel Gorman
2017-02-16 6:23 ` Hillf Danton [this message]
2017-02-16 8:10 ` Mel Gorman
2017-02-16 8:21 ` Hillf Danton
2017-02-16 9:32 ` Mel Gorman
2017-02-20 16:34 ` Vlastimil Babka
2017-02-21 4:10 ` Hillf Danton
2017-02-20 16:42 ` Vlastimil Babka
2017-02-23 15:01 ` Mel Gorman
2017-03-01 9:04 ` Vlastimil Babka
2017-02-15 20:30 ` [PATCH 0/3] Reduce amount of time kswapd sleeps prematurely Andrew Morton
2017-02-15 21:29 ` Mel Gorman
2017-02-15 21:56 ` Andrew Morton
2017-02-15 22:15 ` Mel Gorman
2017-02-15 22:00 ` Vlastimil Babka
2017-03-09 7:56 [PATCH 0/3] Reduce amount of time kswapd sleeps prematurely v2 Mel Gorman
2017-03-09 7:56 ` [PATCH 3/3] mm, vmscan: Prevent kswapd sleeping prematurely due to mismatched classzone_idx Mel Gorman
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