From: Oscar Salvador <osalvador@techadventures.net>
To: Michal Hocko <mhocko@kernel.org>
Cc: akpm@linux-foundation.org, pasha.tatashin@oracle.com,
vbabka@suse.cz, aaron.lu@intel.com, iamjoonsoo.kim@lge.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Oscar Salvador <osalvador@suse.de>
Subject: Re: [PATCH v2 3/5] mm/page_alloc: Optimize free_area_init_core
Date: Thu, 19 Jul 2018 16:03:27 +0200 [thread overview]
Message-ID: <20180719140327.GB10988@techadventures.net> (raw)
In-Reply-To: <20180719134417.GC7193@dhcp22.suse.cz>
On Thu, Jul 19, 2018 at 03:44:17PM +0200, Michal Hocko wrote:
> On Thu 19-07-18 15:27:38, osalvador@techadventures.net wrote:
> > From: Oscar Salvador <osalvador@suse.de>
> >
> > In free_area_init_core we calculate the amount of managed pages
> > we are left with, by substracting the memmap pages and the pages
> > reserved for dma.
> > With the values left, we also account the total of kernel pages and
> > the total of pages.
> >
> > Since memmap pages are calculated from zone->spanned_pages,
> > let us only do these calculcations whenever zone->spanned_pages is greather
> > than 0.
>
> But why do we care? How do we test this? In other words, why is this
> worth merging?
Uhm, unless the values are going to be updated, why do we want to go through all
comparasions/checks?
I thought it was a nice thing to have the chance to skip that block unless we are going to
update the counters.
Again, if you think this only adds complexity and no good, I can drop it.
Thanks
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2018-07-19 14:03 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-19 13:27 [PATCH v2 0/5] Refactor free_area_init_node/free_area_init_core osalvador
2018-07-19 13:27 ` [PATCH v2 1/5] mm/page_alloc: Move ifdefery out of free_area_init_core osalvador
2018-07-19 13:27 ` [PATCH v2 2/5] mm: access zone->node via zone_to_nid() and zone_set_nid() osalvador
2018-07-19 13:40 ` Michal Hocko
2018-07-19 13:44 ` Pavel Tatashin
2018-07-19 13:47 ` Michal Hocko
2018-07-19 13:27 ` [PATCH v2 3/5] mm/page_alloc: Optimize free_area_init_core osalvador
2018-07-19 13:44 ` Michal Hocko
2018-07-19 14:03 ` Oscar Salvador [this message]
2018-07-19 15:15 ` Michal Hocko
2018-07-19 20:52 ` Oscar Salvador
2018-07-20 10:03 ` Oscar Salvador
2018-07-23 8:35 ` Michal Hocko
2018-07-23 11:42 ` Oscar Salvador
2018-07-23 8:30 ` Michal Hocko
2018-07-19 13:27 ` [PATCH v2 4/5] mm/page_alloc: Inline function to handle CONFIG_DEFERRED_STRUCT_PAGE_INIT osalvador
2018-07-19 13:45 ` Michal Hocko
2018-07-19 13:27 ` [PATCH v2 5/5] mm/page_alloc: Only call pgdat_set_deferred_range when the system boots osalvador
2018-07-19 13:46 ` Michal Hocko
2018-07-19 13:58 ` Oscar Salvador
2018-07-19 14:03 ` Michal Hocko
2018-07-19 14:27 ` Pavel Tatashin
2018-07-19 15:01 ` Oscar Salvador
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