From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>, Nathan Zimmer <nzimmer@sgi.com>,
Dave Hansen <dave.hansen@intel.com>,
Waiman Long <waiman.long@hp.com>,
Scott Norton <scott.norton@hp.com>,
Daniel J Blueman <daniel@numascale.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 07/13] mm: meminit: Initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set
Date: Tue, 28 Apr 2015 10:53:23 +0100 [thread overview]
Message-ID: <20150428095323.GK2449@suse.de> (raw)
In-Reply-To: <20150427154344.421fd9f151bf27d365d02fd2@linux-foundation.org>
On Mon, Apr 27, 2015 at 03:43:44PM -0700, Andrew Morton wrote:
> On Thu, 23 Apr 2015 11:33:10 +0100 Mel Gorman <mgorman@suse.de> wrote:
>
> > This patch initalises all low memory struct pages and 2G of the highest zone
> > on each node during memory initialisation if CONFIG_DEFERRED_STRUCT_PAGE_INIT
> > is set. That config option cannot be set but will be available in a later
> > patch. Parallel initialisation of struct page depends on some features
> > from memory hotplug and it is necessary to alter alter section annotations.
> >
> > ...
> >
> > +#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
> > +#define __defermem_init __meminit
> > +#define __defer_init __meminit
> > +#else
> > +#define __defermem_init
> > +#define __defer_init __init
> > +#endif
>
> Could we get some comments describing these? What they do, when and
> where they should be used. I have a suspicion that the naming isn't
> good, but I didn't spend a lot of time reverse-engineering the
> intent...
>
Of course. The next version will have
+/*
+ * Deferred struct page initialisation requires some early init functions that
+ * are removed before kswapd is up and running. The feature depends on memory
+ * hotplug so put the data and code required by deferred initialisation into
+ * the __meminit section where they are preserved.
+ */
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2015-04-28 9:53 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-23 10:33 [PATCH 0/13] Parallel struct page initialisation v3 Mel Gorman
2015-04-23 10:33 ` [PATCH 01/13] memblock: Introduce a for_each_reserved_mem_region iterator Mel Gorman
2015-04-23 10:33 ` [PATCH 02/13] mm: meminit: Move page initialization into a separate function Mel Gorman
2015-04-27 22:46 ` Andrew Morton
2015-04-28 8:28 ` Mel Gorman
2015-04-28 16:02 ` nzimmer
2015-04-28 22:41 ` Andrew Morton
2015-04-28 23:05 ` Mel Gorman
2015-04-23 10:33 ` [PATCH 03/13] mm: meminit: Only set page reserved in the memblock region Mel Gorman
2015-04-27 22:43 ` Andrew Morton
2015-04-23 10:33 ` [PATCH 04/13] mm: page_alloc: Pass PFN to __free_pages_bootmem Mel Gorman
2015-04-23 10:33 ` [PATCH 05/13] mm: meminit: Make __early_pfn_to_nid SMP-safe and introduce meminit_pfn_in_nid Mel Gorman
2015-04-27 22:43 ` Andrew Morton
2015-04-28 9:37 ` Mel Gorman
2015-04-23 10:33 ` [PATCH 06/13] mm: meminit: Inline some helper functions Mel Gorman
2015-04-23 10:33 ` [PATCH 07/13] mm: meminit: Initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set Mel Gorman
2015-04-23 15:56 ` Mel Gorman
2015-04-27 22:43 ` Andrew Morton
2015-04-28 9:53 ` Mel Gorman [this message]
2015-04-28 13:48 ` Andrew Morton
2015-04-28 14:56 ` Mel Gorman
2015-04-23 10:33 ` [PATCH 08/13] mm: meminit: Initialise remaining struct pages in parallel with kswapd Mel Gorman
2015-04-27 22:43 ` Andrew Morton
2015-04-23 10:33 ` [PATCH 09/13] mm: meminit: Minimise number of pfn->page lookups during initialisation Mel Gorman
2015-04-23 10:33 ` [PATCH 10/13] x86: mm: Enable deferred struct page initialisation on x86-64 Mel Gorman
2015-04-23 10:33 ` [PATCH 11/13] mm: meminit: Free pages in large chunks where possible Mel Gorman
2015-04-27 22:43 ` Andrew Morton
2015-04-28 11:38 ` Mel Gorman
2015-04-23 10:33 ` [PATCH 12/13] mm: meminit: Reduce number of times pageblocks are set during struct page init Mel Gorman
2015-04-23 10:33 ` [PATCH 13/13] mm: meminit: Remove mminit_verify_page_links Mel Gorman
2015-04-23 15:53 ` [PATCH 0/13] Parallel struct page initialisation v3 Daniel J Blueman
2015-04-23 16:30 ` Mel Gorman
2015-04-24 19:48 ` Waiman Long
2015-04-29 1:31 ` Waiman Long
-- strict thread matches above, loose matches on Subject: below --
2015-04-28 14:36 [PATCH 0/13] Parallel struct page initialisation v4 Mel Gorman
2015-04-28 14:37 ` [PATCH 07/13] mm: meminit: Initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set Mel Gorman
2015-04-29 21:19 ` Andrew Morton
2015-04-30 8:45 ` Mel Gorman
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