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From: Michal Hocko <mhocko@kernel.org>
To: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
	pavel.tatashin@microsoft.com, dave.jiang@intel.com,
	linux-kernel@vger.kernel.org, willy@infradead.org,
	davem@davemloft.net, yi.z.zhang@linux.intel.com,
	khalid.aziz@oracle.com, rppt@linux.vnet.ibm.com, vbabka@suse.cz,
	sparclinux@vger.kernel.org, dan.j.williams@intel.com,
	ldufour@linux.vnet.ibm.com, mgorman@techsingularity.net,
	mingo@kernel.org, kirill.shutemov@linux.intel.com
Subject: Re: [mm PATCH v3 3/6] mm: Use memblock/zone specific iterator for handling deferred page init
Date: Wed, 17 Oct 2018 11:11:54 +0200	[thread overview]
Message-ID: <20181017091154.GK18839@dhcp22.suse.cz> (raw)
In-Reply-To: <20181015202709.2171.75580.stgit@localhost.localdomain>

On Mon 15-10-18 13:27:09, Alexander Duyck wrote:
> This patch introduces a new iterator for_each_free_mem_pfn_range_in_zone.
> 
> This iterator will take care of making sure a given memory range provided
> is in fact contained within a zone. It takes are of all the bounds checking
> we were doing in deferred_grow_zone, and deferred_init_memmap. In addition
> it should help to speed up the search a bit by iterating until the end of a
> range is greater than the start of the zone pfn range, and will exit
> completely if the start is beyond the end of the zone.
> 
> This patch adds yet another iterator called
> for_each_free_mem_range_in_zone_from and then uses it to support
> initializing and freeing pages in groups no larger than MAX_ORDER_NR_PAGES.
> By doing this we can greatly improve the cache locality of the pages while
> we do several loops over them in the init and freeing process.
> 
> We are able to tighten the loops as a result since we only really need the
> checks for first_init_pfn in our first iteration and after that we can
> assume that all future values will be greater than this. So I have added a
> function called deferred_init_mem_pfn_range_in_zone that primes the
> iterators and if it fails we can just exit.

Numbers please.

Besides that, this adds a lot of code and I am not convinced the result
is so much better to justify that. 

> Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
> ---
>  include/linux/memblock.h |   58 +++++++++++++++
>  mm/memblock.c            |   63 ++++++++++++++++
>  mm/page_alloc.c          |  176 ++++++++++++++++++++++++++++++++--------------
>  3 files changed, 242 insertions(+), 55 deletions(-)
-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2018-10-17  9:11 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-15 20:26 [mm PATCH v3 0/6] Deferred page init improvements Alexander Duyck
2018-10-15 20:26 ` [mm PATCH v3 1/6] mm: Use mm_zero_struct_page from SPARC on all 64b architectures Alexander Duyck
2018-10-16 19:01   ` Pavel Tatashin
2018-10-17  7:30     ` Mike Rapoport
2018-10-17 14:52       ` Alexander Duyck
2018-10-17  8:47   ` Michal Hocko
2018-10-17 15:07     ` Alexander Duyck
2018-10-17 15:12       ` Pavel Tatashin
2018-10-17 15:40         ` David Laight
2018-10-17 16:31           ` Alexander Duyck
2018-10-17 17:08             ` Pavel Tatashin
2018-10-17 16:34       ` Michal Hocko
2018-10-15 20:27 ` [mm PATCH v3 2/6] mm: Drop meminit_pfn_in_nid as it is redundant Alexander Duyck
2018-10-16 20:33   ` Pavel Tatashin
2018-10-16 20:49     ` Alexander Duyck
2018-10-16 21:06       ` Pavel Tatashin
2018-10-17  9:04   ` Michal Hocko
2018-10-15 20:27 ` [mm PATCH v3 3/6] mm: Use memblock/zone specific iterator for handling deferred page init Alexander Duyck
2018-10-17  9:11   ` Michal Hocko [this message]
2018-10-17 15:17     ` Alexander Duyck
2018-10-17 16:42   ` Mike Rapoport
2018-10-15 20:27 ` [mm PATCH v3 4/6] mm: Move hot-plug specific memory init into separate functions and optimize Alexander Duyck
2018-10-17  9:18   ` Michal Hocko
2018-10-17 15:26     ` Alexander Duyck
2018-10-24 12:36       ` Michal Hocko
2018-10-24 15:08         ` Alexander Duyck
2018-10-24 15:27           ` Michal Hocko
2018-10-24 17:35             ` Alexander Duyck
2018-10-25 12:41               ` Michal Hocko
2018-10-15 20:27 ` [mm PATCH v3 5/6] mm: Use common iterator for deferred_init_pages and deferred_free_pages Alexander Duyck
2018-10-15 20:27 ` [mm PATCH v3 6/6] mm: Add reserved flag setting to set_page_links Alexander Duyck

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