From: "Hillf Danton" <hillf.zj@alibaba-inc.com>
To: "'Mel Gorman'" <mgorman@techsingularity.net>,
"'Jesper Dangaard Brouer'" <brouer@redhat.com>
Cc: "'Linux Kernel'" <linux-kernel@vger.kernel.org>,
"'Linux-MM'" <linux-mm@kvack.org>
Subject: Re: [PATCH 3/4] mm, page_allocator: Only use per-cpu allocator for irq-safe requests
Date: Fri, 06 Jan 2017 11:26:46 +0800 [thread overview]
Message-ID: <00ee01d267cc$b61feaa0$225fbfe0$@alibaba-inc.com> (raw)
In-Reply-To: <20170104111049.15501-4-mgorman@techsingularity.net>
On Wednesday, January 04, 2017 7:11 PM Mel Gorman wrote:
> @@ -2647,9 +2644,8 @@ static struct page *rmqueue_pcplist(struct zone *preferred_zone,
> struct list_head *list;
> bool cold = ((gfp_flags & __GFP_COLD) != 0);
> struct page *page;
> - unsigned long flags;
>
> - local_irq_save(flags);
> + preempt_disable();
> pcp = &this_cpu_ptr(zone->pageset)->pcp;
> list = &pcp->lists[migratetype];
> page = __rmqueue_pcplist(zone, order, gfp_flags, migratetype,
> @@ -2658,7 +2654,7 @@ static struct page *rmqueue_pcplist(struct zone *preferred_zone,
> __count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order);
> zone_statistics(preferred_zone, zone, gfp_flags);
> }
> - local_irq_restore(flags);
> + preempt_enable();
> return page;
> }
>
With PREEMPT configured, preempt_enable() adds entry point to schedule().
Is that needed when we try to allocate a page?
Hillf
WARNING: multiple messages have this Message-ID (diff)
From: "Hillf Danton" <hillf.zj@alibaba-inc.com>
To: 'Mel Gorman' <mgorman@techsingularity.net>,
'Jesper Dangaard Brouer' <brouer@redhat.com>
Cc: 'Linux Kernel' <linux-kernel@vger.kernel.org>,
'Linux-MM' <linux-mm@kvack.org>
Subject: Re: [PATCH 3/4] mm, page_allocator: Only use per-cpu allocator for irq-safe requests
Date: Fri, 06 Jan 2017 11:26:46 +0800 [thread overview]
Message-ID: <00ee01d267cc$b61feaa0$225fbfe0$@alibaba-inc.com> (raw)
In-Reply-To: <20170104111049.15501-4-mgorman@techsingularity.net>
On Wednesday, January 04, 2017 7:11 PM Mel Gorman wrote:
> @@ -2647,9 +2644,8 @@ static struct page *rmqueue_pcplist(struct zone *preferred_zone,
> struct list_head *list;
> bool cold = ((gfp_flags & __GFP_COLD) != 0);
> struct page *page;
> - unsigned long flags;
>
> - local_irq_save(flags);
> + preempt_disable();
> pcp = &this_cpu_ptr(zone->pageset)->pcp;
> list = &pcp->lists[migratetype];
> page = __rmqueue_pcplist(zone, order, gfp_flags, migratetype,
> @@ -2658,7 +2654,7 @@ static struct page *rmqueue_pcplist(struct zone *preferred_zone,
> __count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order);
> zone_statistics(preferred_zone, zone, gfp_flags);
> }
> - local_irq_restore(flags);
> + preempt_enable();
> return page;
> }
>
With PREEMPT configured, preempt_enable() adds entry point to schedule().
Is that needed when we try to allocate a page?
Hillf
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next prev parent reply other threads:[~2017-01-06 3:27 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-04 11:10 [RFC PATCH 0/4] Fast noirq bulk page allocator Mel Gorman
2017-01-04 11:10 ` Mel Gorman
2017-01-04 11:10 ` [PATCH 1/4] mm, page_alloc: Split buffered_rmqueue Mel Gorman
2017-01-04 11:10 ` Mel Gorman
2017-01-04 11:10 ` [PATCH 2/4] mm, page_alloc: Split alloc_pages_nodemask Mel Gorman
2017-01-04 11:10 ` Mel Gorman
2017-01-04 11:10 ` [PATCH 3/4] mm, page_allocator: Only use per-cpu allocator for irq-safe requests Mel Gorman
2017-01-04 11:10 ` Mel Gorman
2017-01-04 14:20 ` Jesper Dangaard Brouer
2017-01-04 14:20 ` Jesper Dangaard Brouer
2017-01-06 3:26 ` Hillf Danton [this message]
2017-01-06 3:26 ` Hillf Danton
2017-01-06 10:15 ` Mel Gorman
2017-01-06 10:15 ` Mel Gorman
2017-01-09 3:14 ` Hillf Danton
2017-01-09 3:14 ` Hillf Danton
2017-01-09 9:48 ` Mel Gorman
2017-01-09 9:48 ` Mel Gorman
2017-01-09 9:55 ` Hillf Danton
2017-01-09 9:55 ` Hillf Danton
2017-01-04 11:10 ` [PATCH 4/4] mm, page_alloc: Add a bulk page allocator Mel Gorman
2017-01-04 11:10 ` Mel Gorman
2017-01-04 13:48 ` Jesper Dangaard Brouer
2017-01-04 13:48 ` Jesper Dangaard Brouer
2017-01-04 14:03 ` Mel Gorman
2017-01-04 14:03 ` Mel Gorman
2017-01-09 16:35 [RFC PATCH 0/4] Fast noirq bulk page allocator v2r7 Mel Gorman
2017-01-09 16:35 ` [PATCH 3/4] mm, page_allocator: Only use per-cpu allocator for irq-safe requests Mel Gorman
2017-01-09 16:35 ` Mel Gorman
2017-01-11 12:44 ` Jesper Dangaard Brouer
2017-01-11 12:44 ` Jesper Dangaard Brouer
2017-01-11 13:27 ` Jesper Dangaard Brouer
2017-01-11 13:27 ` Jesper Dangaard Brouer
2017-01-12 10:47 ` Mel Gorman
2017-01-12 10:47 ` Mel Gorman
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