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Date: Tue, 11 Dec 2012 05:28:33 -0600
From: Simon Jeons <simon.jeons@...il.com>
To: Tang Chen <tangchen@...fujitsu.com>
Cc: Jianguo Wu <wujianguo@...wei.com>, jiang.liu@...wei.com,
hpa@...or.com, akpm@...ux-foundation.org, wency@...fujitsu.com,
laijs@...fujitsu.com, linfeng@...fujitsu.com, yinghai@...nel.org,
isimatu.yasuaki@...fujitsu.com, rob@...dley.net,
kosaki.motohiro@...fujitsu.com, minchan.kim@...il.com,
mgorman@...e.de, rientjes@...gle.com, rusty@...tcorp.com.au,
lliubbo@...il.com, jaegeuk.hanse@...il.com, tony.luck@...el.com,
glommer@...allels.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 3/5] page_alloc: Introduce zone_movable_limit[] to
keep movable limit for nodes
On Tue, 2012-12-11 at 11:32 +0800, Tang Chen wrote:
> On 12/11/2012 11:07 AM, Jianguo Wu wrote:
> > On 2012/12/11 10:33, Tang Chen wrote:
> >
> >> This patch introduces a new array zone_movable_limit[] to store the
> >> ZONE_MOVABLE limit from movablecore_map boot option for all nodes.
> >> The function sanitize_zone_movable_limit() will find out to which
> >> node the ranges in movable_map.map[] belongs, and calculates the
> >> low boundary of ZONE_MOVABLE for each node.
What's the difference between zone_movable_limit[nid] and
zone_movable_pfn[nid]?
> >>
> >> Signed-off-by: Tang Chen<tangchen@...fujitsu.com>
> >> Signed-off-by: Jiang Liu<jiang.liu@...wei.com>
> >> Reviewed-by: Wen Congyang<wency@...fujitsu.com>
> >> Reviewed-by: Lai Jiangshan<laijs@...fujitsu.com>
> >> Tested-by: Lin Feng<linfeng@...fujitsu.com>
> >> ---
> >> mm/page_alloc.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >> 1 files changed, 77 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> >> index 1c91d16..4853619 100644
> >> --- a/mm/page_alloc.c
> >> +++ b/mm/page_alloc.c
> >> @@ -206,6 +206,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
> >> static unsigned long __initdata required_kernelcore;
> >> static unsigned long __initdata required_movablecore;
> >> static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
> >> +static unsigned long __meminitdata zone_movable_limit[MAX_NUMNODES];
> >>
> >> /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
> >> int movable_zone;
> >> @@ -4340,6 +4341,77 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
> >> return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
> >> }
> >>
> >> +/**
> >> + * sanitize_zone_movable_limit - Sanitize the zone_movable_limit array.
> >> + *
> >> + * zone_movable_limit is initialized as 0. This function will try to get
> >> + * the first ZONE_MOVABLE pfn of each node from movablecore_map, and
> >> + * assigne them to zone_movable_limit.
> >> + * zone_movable_limit[nid] == 0 means no limit for the node.
> >> + *
> >> + * Note: Each range is represented as [start_pfn, end_pfn)
> >> + */
> >> +static void __meminit sanitize_zone_movable_limit(void)
> >> +{
> >> + int map_pos = 0, i, nid;
> >> + unsigned long start_pfn, end_pfn;
> >> +
> >> + if (!movablecore_map.nr_map)
> >> + return;
> >> +
> >> + /* Iterate all ranges from minimum to maximum */
> >> + for_each_mem_pfn_range(i, MAX_NUMNODES,&start_pfn,&end_pfn,&nid) {
> >> + /*
> >> + * If we have found lowest pfn of ZONE_MOVABLE of the node
> >> + * specified by user, just go on to check next range.
> >> + */
> >> + if (zone_movable_limit[nid])
> >> + continue;
> >> +
> >> +#ifdef CONFIG_ZONE_DMA
> >> + /* Skip DMA memory. */
> >> + if (start_pfn< arch_zone_highest_possible_pfn[ZONE_DMA])
> >> + start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA];
> >> +#endif
> >> +
> >> +#ifdef CONFIG_ZONE_DMA32
> >> + /* Skip DMA32 memory. */
> >> + if (start_pfn< arch_zone_highest_possible_pfn[ZONE_DMA32])
> >> + start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA32];
> >> +#endif
> >> +
> >> +#ifdef CONFIG_HIGHMEM
> >> + /* Skip lowmem if ZONE_MOVABLE is highmem. */
> >> + if (zone_movable_is_highmem()&&
> >
> > Hi Tang,
> >
> > I think zone_movable_is_highmem() is not work correctly here.
> > sanitize_zone_movable_limit
> > zone_movable_is_highmem<--using movable_zone here
> > find_zone_movable_pfns_for_nodes
> > find_usable_zone_for_movable<--movable_zone is specified here
> >
> > I think Jiang Liu's patch works fine for highmem, please refer to:
> > http://marc.info/?l=linux-mm&m=135476085816087&w=2
>
> Hi Wu,
>
> Yes, I forgot movable_zone think. Thanks for reminding me. :)
>
> But Liu's patch you just mentioned, I didn't use it because I
> don't think we should skip kernelcore when movablecore_map is specified.
> If these 2 options are not conflict, we should satisfy them both. :)
>
> Of course, I also think Liu's suggestion is wonderful. But I think we
> need more discussion on it. :)
>
> I'll fix it soon.
> Thanks. :)
>
> >
> > Thanks,
> > Jianguo Wu
> >
> >> + start_pfn< arch_zone_lowest_possible_pfn[ZONE_HIGHMEM])
> >> + start_pfn = arch_zone_lowest_possible_pfn[ZONE_HIGHMEM];
> >> +#endif
> >> +
> >> + if (start_pfn>= end_pfn)
> >> + continue;
> >> +
> >> + while (map_pos< movablecore_map.nr_map) {
> >> + if (end_pfn<= movablecore_map.map[map_pos].start_pfn)
> >> + break;
> >> +
> >> + if (start_pfn>= movablecore_map.map[map_pos].end_pfn) {
> >> + map_pos++;
> >> + continue;
> >> + }
> >> +
> >> + /*
> >> + * The start_pfn of ZONE_MOVABLE is either the minimum
> >> + * pfn specified by movablecore_map, or 0, which means
> >> + * the node has no ZONE_MOVABLE.
> >> + */
> >> + zone_movable_limit[nid] = max(start_pfn,
> >> + movablecore_map.map[map_pos].start_pfn);
> >> +
> >> + break;
> >> + }
> >> + }
> >> +}
> >> +
> >> #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
> >> static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
> >> unsigned long zone_type,
> >> @@ -4358,6 +4430,10 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
> >> return zholes_size[zone_type];
> >> }
> >>
> >> +static void __meminit sanitize_zone_movable_limit(void)
> >> +{
> >> +}
> >> +
> >> #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
> >>
> >> static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
> >> @@ -4923,6 +4999,7 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
> >>
> >> /* Find the PFNs that ZONE_MOVABLE begins at in each node */
> >> memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn));
> >> + sanitize_zone_movable_limit();
> >> find_zone_movable_pfns_for_nodes();
> >>
> >> /* Print out the zone ranges */
> >
> >
> >
> >
>
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