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From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
	sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nvdimm@lists.01.org, davem@davemloft.net,
	pavel.tatashin@microsoft.com, mhocko@suse.com, mingo@kernel.org,
	kirill.shutemov@linux.intel.com, dan.j.williams@intel.com,
	dave.jiang@intel.com, rppt@linux.vnet.ibm.com,
	willy@infradead.org, vbabka@suse.cz, khalid.aziz@oracle.com,
	ldufour@linux.vnet.ibm.com, mgorman@techsingularity.net,
	yi.z.zhang@linux.intel.com
Subject: Re: [mm PATCH v5 6/7] mm: Add reserved flag setting to set_page_links
Date: Fri, 9 Nov 2018 21:11:05 -0500
Message-ID: <20181110021105.ln7geexvln5ap5fg@xakep.localdomain> (raw)
In-Reply-To: <154145279604.30046.5646399488589213615.stgit@ahduyck-desk1.jf.intel.com>

On 18-11-05 13:19:56, Alexander Duyck wrote:
> This patch modifies the set_page_links function to include the setting of
> the reserved flag via a simple AND and OR operation. The motivation for
> this is the fact that the existing __set_bit call still seems to have
> effects on performance as replacing the call with the AND and OR can reduce
> initialization time.
> 
> Looking over the assembly code before and after the change the main
> difference between the two is that the reserved bit is stored in a value
> that is generated outside of the main initialization loop and is then
> written with the other flags field values in one write to the page->flags
> value. Previously the generated value was written and then then a btsq
> instruction was issued.
> 
> On my x86_64 test system with 3TB of persistent memory per node I saw the
> persistent memory initialization time on average drop from 23.49s to
> 19.12s per node.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>

Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-05 21:19 [mm PATCH v5 0/7] Deferred page init improvements Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 1/7] mm: Use mm_zero_struct_page from SPARC on all 64b architectures Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 2/7] mm: Drop meminit_pfn_in_nid as it is redundant Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 3/7] mm: Implement new zone specific memblock iterator Alexander Duyck
2018-11-09 23:26   ` Pavel Tatashin
2018-11-09 23:58     ` Alexander Duyck
2018-11-10  0:11       ` Pavel Tatashin
2018-11-05 21:19 ` [mm PATCH v5 4/7] mm: Initialize MAX_ORDER_NR_PAGES at a time instead of doing larger sections Alexander Duyck
2018-11-10  1:02   ` Pavel Tatashin
2018-11-19 18:53     ` Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 5/7] mm: Move hot-plug specific memory init into separate functions and optimize Alexander Duyck
2018-11-10  2:07   ` Pavel Tatashin
2018-11-05 21:19 ` [mm PATCH v5 6/7] mm: Add reserved flag setting to set_page_links Alexander Duyck
2018-11-10  2:11   ` Pavel Tatashin [this message]
2018-11-05 21:20 ` [mm PATCH v5 7/7] mm: Use common iterator for deferred_init_pages and deferred_free_pages Alexander Duyck
2018-11-10  4:13   ` Pavel Tatashin
2018-11-12 15:12     ` Alexander Duyck
2018-11-09 21:15 ` [mm PATCH v5 0/7] Deferred page init improvements Pavel Tatashin
2018-11-09 23:14   ` Alexander Duyck
2018-11-10  0:00     ` Pavel Tatashin
2018-11-10  0:46       ` Alexander Duyck
2018-11-10  1:16         ` Pavel Tatashin
2018-11-12 19:10           ` Alexander Duyck
2018-11-12 20:37             ` Pavel Tatashin
2018-11-12 16:25       ` Daniel Jordan
2018-11-14 15:07 ` Michal Hocko
2018-11-14 19:12   ` Pavel Tatashin
2018-11-14 21:35     ` Michal Hocko
2018-11-15  0:50   ` Alexander Duyck
2018-11-15  1:55     ` Mike Rapoport
2018-11-15 19:09       ` Mike Rapoport
2018-11-15  8:10     ` Michal Hocko
2018-11-15 16:02       ` Alexander Duyck
2018-11-15 16:40         ` Michal Hocko

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