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SubjectRe: [PATCH 2/4] alloc_contig_pages() find appropriate physical memory range
On Mon, 22 Nov 2010 00:21:31 +0900
Minchan Kim <minchan.kim@gmail.com> wrote:

> Acked-by: Minchan Kim <minchan.kim@gmail.com>
>
> Just some trivial comment below.
>
> Intentionally, I don't add Reviewed-by.
> Instead of it, I add Acked-by since I support this work.
Thanks.

>
> I reviewed your old version but have forgot it. :(

Sorry, I had a vacation ;(

> So I will have a time to review your code and then add Reviewed-by.
>
> > ---
> > mm/page_isolation.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 146 insertions(+)
> >
> > Index: mmotm-1117/mm/page_isolation.c
> > ===================================================================
> > --- mmotm-1117.orig/mm/page_isolation.c
> > +++ mmotm-1117/mm/page_isolation.c
> > @@ -7,6 +7,7 @@
> > #include <linux/pageblock-flags.h>
> > #include <linux/memcontrol.h>
> > #include <linux/migrate.h>
> > +#include <linux/memory_hotplug.h>
> > #include <linux/mm_inline.h>
> > #include "internal.h"
> >
> > @@ -250,3 +251,148 @@ int do_migrate_range(unsigned long start
> > out:
> > return ret;
> > }
> > +
> > +/*
> > + * Functions for getting contiguous MOVABLE pages in a zone.
> > + */
> > +struct page_range {
> > + unsigned long base; /* Base address of searching contigouous block */
> > + unsigned long end;
> > + unsigned long pages;/* Length of contiguous block */
> > + int align_order;
> > + unsigned long align_mask;
> > +};
> > +
> > +int __get_contig_block(unsigned long pfn, unsigned long nr_pages, void *arg)
> > +{
> > + struct page_range *blockinfo = arg;
> > + unsigned long end;
> > +
> > + end = pfn + nr_pages;
> > + pfn = ALIGN(pfn, 1 << blockinfo->align_order);
> > + end = end & ~(MAX_ORDER_NR_PAGES - 1);
> > +
> > + if (end < pfn)
> > + return 0;
> > + if (end - pfn >= blockinfo->pages) {
> > + blockinfo->base = pfn;
> > + blockinfo->end = end;
> > + return 1;
> > + }
> > + return 0;
> > +}
> > +
> > +static void __trim_zone(struct zone *zone, struct page_range *range)
> > +{
> > + unsigned long pfn;
> > + /*
> > + * skip pages which dones'nt under the zone.
>
> typo
>
will fix.


> > + * There are some archs which zones are not in linear layout.
> > + */
> > + if (page_zone(pfn_to_page(range->base)) != zone) {
> > + for (pfn = range->base;
> > + pfn < range->end;
> > + pfn += MAX_ORDER_NR_PAGES) {
> > + if (page_zone(pfn_to_page(pfn)) == zone)
> > + break;
> > + }
> > + range->base = min(pfn, range->end);
> > + }
> > + /* Here, range-> base is in the zone if range->base != range->end */
> > + for (pfn = range->base;
> > + pfn < range->end;
> > + pfn += MAX_ORDER_NR_PAGES) {
> > + if (zone != page_zone(pfn_to_page(pfn))) {
> > + pfn = pfn - MAX_ORDER_NR_PAGES;
> > + break;
> > + }
> > + }
> > + range->end = min(pfn, range->end);
> > + return;
> > +}
> > +
> > +/*
> > + * This function is for finding a contiguous memory block which has length
> > + * of pages and MOVABLE. If it finds, make the range of pages as ISOLATED
> > + * and return the first page's pfn.
> > + * This checks all pages in the returned range is free of Pg_LRU. To reduce
>
> typo
>
will lfix.

> > + * the risk of false-positive testing, lru_add_drain_all() should be called
> > + * before this function to reduce pages on pagevec for zones.
> > + */
> > +
> > +static unsigned long find_contig_block(unsigned long base,
> > + unsigned long end, unsigned long pages,
> > + int align_order, struct zone *zone)
> > +{
> > + unsigned long pfn, pos;
> > + struct page_range blockinfo;
> > + int ret;
> > +
> > + VM_BUG_ON(pages & (MAX_ORDER_NR_PAGES - 1));
> > + VM_BUG_ON(base & ((1 << align_order) - 1));
> > +retry:
> > + blockinfo.base = base;
> > + blockinfo.end = end;
> > + blockinfo.pages = pages;
> > + blockinfo.align_order = align_order;
> > + blockinfo.align_mask = (1 << align_order) - 1;
> > + /*
> > + * At first, check physical page layout and skip memory holes.
> > + */
> > + ret = walk_system_ram_range(base, end - base, &blockinfo,
> > + __get_contig_block);
>
> We need #include <linux/ioport.h>
>

ok.

Thanks,
-Kame



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