All of lore.kernel.org
 help / color / mirror / Atom feed
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

WARNING: multiple messages have this Message-ID (diff)
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

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  reply	other threads:[~2015-04-28  9:53 UTC|newest]

Thread overview: 74+ 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 ` 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   ` Mel Gorman
2015-04-23 10:33 ` [PATCH 02/13] mm: meminit: Move page initialization into a separate function Mel Gorman
2015-04-23 10:33   ` Mel Gorman
2015-04-27 22:46   ` Andrew Morton
2015-04-27 22:46     ` Andrew Morton
2015-04-28  8:28     ` Mel Gorman
2015-04-28  8:28       ` Mel Gorman
2015-04-28 16:02       ` nzimmer
2015-04-28 16:02         ` nzimmer
2015-04-28 22:41       ` Andrew Morton
2015-04-28 22:41         ` Andrew Morton
2015-04-28 23:05         ` Mel Gorman
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
2015-04-23 10:33   ` Mel Gorman
2015-04-27 22:43   ` Andrew Morton
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   ` 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
2015-04-23 10:33   ` Mel Gorman
2015-04-27 22:43   ` Andrew Morton
2015-04-27 22:43     ` Andrew Morton
2015-04-28  9:37     ` Mel Gorman
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   ` 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 10:33   ` Mel Gorman
2015-04-23 15:56   ` Mel Gorman
2015-04-23 15:56     ` Mel Gorman
2015-04-27 22:43   ` Andrew Morton
2015-04-27 22:43     ` Andrew Morton
2015-04-28  9:53     ` Mel Gorman [this message]
2015-04-28  9:53       ` Mel Gorman
2015-04-28 13:48       ` Andrew Morton
2015-04-28 13:48         ` Andrew Morton
2015-04-28 14:56         ` Mel Gorman
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
2015-04-23 10:33   ` Mel Gorman
2015-04-27 22:43   ` Andrew Morton
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   ` 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   ` Mel Gorman
2015-04-23 10:33 ` [PATCH 11/13] mm: meminit: Free pages in large chunks where possible Mel Gorman
2015-04-23 10:33   ` Mel Gorman
2015-04-27 22:43   ` Andrew Morton
2015-04-27 22:43     ` Andrew Morton
2015-04-28 11:38     ` Mel Gorman
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   ` Mel Gorman
2015-04-23 10:33 ` [PATCH 13/13] mm: meminit: Remove mminit_verify_page_links Mel Gorman
2015-04-23 10:33   ` Mel Gorman
2015-04-23 15:53 ` [PATCH 0/13] Parallel struct page initialisation v3 Daniel J Blueman
2015-04-23 15:53   ` Daniel J Blueman
2015-04-23 16:30   ` Mel Gorman
2015-04-23 16:30     ` Mel Gorman
2015-04-24 19:48   ` Waiman Long
2015-04-24 19:48     ` Waiman Long
2015-04-29  1:31   ` Waiman Long
2015-04-29  1:31     ` Waiman Long
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
2015-04-28 14:37   ` Mel Gorman
2015-04-29 21:19   ` Andrew Morton
2015-04-29 21:19     ` Andrew Morton
2015-04-30  8:45     ` Mel Gorman
2015-04-30  8:45       ` Mel Gorman

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20150428095323.GK2449@suse.de \
    --to=mgorman@suse.de \
    --cc=akpm@linux-foundation.org \
    --cc=daniel@numascale.com \
    --cc=dave.hansen@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=nzimmer@sgi.com \
    --cc=scott.norton@hp.com \
    --cc=waiman.long@hp.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.