From: Mel Gorman <mgorman@techsingularity.net>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Hillf Danton <hillf.zj@alibaba-inc.com>,
Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: [PATCH 4/4] mm, page_alloc: Only use per-cpu allocator for irq-safe requests
Date: Mon, 23 Jan 2017 11:17:59 +0000 [thread overview]
Message-ID: <20170123111759.fjpox4d22rsknb4a@techsingularity.net> (raw)
In-Reply-To: <675145cb-e026-7ceb-ce96-446d3dd61fe0@suse.cz>
On Fri, Jan 20, 2017 at 04:02:56PM +0100, Vlastimil Babka wrote:
> On 01/17/2017 10:29 AM, Mel Gorman wrote:
>
> [...]
>
> > @@ -1244,10 +1243,8 @@ static void __free_pages_ok(struct page *page, unsigned int order)
> > return;
> >
> > migratetype = get_pfnblock_migratetype(page, pfn);
> > - local_irq_save(flags);
> > - __count_vm_events(PGFREE, 1 << order);
> > + count_vm_events(PGFREE, 1 << order);
>
> Maybe this could be avoided by moving the counting into free_one_page()?
> Diff suggestion at the end of e-mail.
>
Yes, that would work.
> > @@ -2472,16 +2470,20 @@ void free_hot_cold_page(struct page *page, bool cold)
> > {
> > struct zone *zone = page_zone(page);
> > struct per_cpu_pages *pcp;
> > - unsigned long flags;
> > unsigned long pfn = page_to_pfn(page);
> > int migratetype;
> >
> > if (!free_pcp_prepare(page))
> > return;
> >
> > + if (in_interrupt()) {
> > + __free_pages_ok(page, 0);
> > + return;
> > + }
>
> I think this should go *before* free_pcp_prepare() otherwise
> free_pages_prepare() gets done twice in interrupt.
>
You're right, thanks.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2017-01-23 11:18 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-17 9:29 [PATCH 0/4] Use per-cpu allocator for !irq requests and prepare for a bulk allocator v4 Mel Gorman
2017-01-17 9:29 ` [PATCH 1/4] mm, page_alloc: Split buffered_rmqueue Mel Gorman
2017-01-17 18:07 ` Jesper Dangaard Brouer
2017-01-17 18:17 ` Vlastimil Babka
2017-01-17 20:20 ` Mel Gorman
2017-01-17 21:07 ` Mel Gorman
2017-01-17 21:24 ` Vlastimil Babka
2017-01-17 9:29 ` [PATCH 2/4] mm, page_alloc: Split alloc_pages_nodemask Mel Gorman
2017-01-17 9:29 ` [PATCH 3/4] mm, page_alloc: Drain per-cpu pages from workqueue context Mel Gorman
2017-01-20 14:26 ` Vlastimil Babka
2017-01-20 15:26 ` Mel Gorman
2017-01-23 16:29 ` Petr Mladek
2017-01-23 16:50 ` Mel Gorman
2017-01-23 17:03 ` Tejun Heo
2017-01-23 20:04 ` Mel Gorman
2017-01-23 20:55 ` Tejun Heo
2017-01-23 23:04 ` Mel Gorman
2017-01-24 16:07 ` Tejun Heo
2017-01-24 23:54 ` Mel Gorman
2017-01-25 2:02 ` Tejun Heo
2017-01-25 8:30 ` Mel Gorman
2017-01-24 11:08 ` Vlastimil Babka
2017-01-17 9:29 ` [PATCH 4/4] mm, page_alloc: Only use per-cpu allocator for irq-safe requests Mel Gorman
2017-01-20 15:02 ` Vlastimil Babka
2017-01-23 11:17 ` Mel Gorman [this message]
-- strict thread matches above, loose matches on Subject: below --
2017-01-23 15:39 [PATCH 0/4] Use per-cpu allocator for !irq requests and prepare for a bulk allocator v5 Mel Gorman
2017-01-23 15:39 ` [PATCH 4/4] mm, page_alloc: Only use per-cpu allocator for irq-safe requests Mel Gorman
2017-01-24 13:16 ` Vlastimil Babka
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