On Mon, 29 Aug 2011 16:48:46 +0900
Minchan Kim <minchan.kim@xxxxxxxxx> wrote:
> On Fri, Jul 29, 2011 at 4:58 PM, Konstantin Khlebnikov
> <khlebnikov@xxxxxxxxxx> wrote:
> > This patch adds helper free_hot_cold_page_list() to free list of 0-order pages.
> > It frees pages directly from list without temporary page-vector.
> > It also calls trace_mm_pagevec_free() to simulate pagevec_free() behaviour.
> >
> > bloat-o-meter:
> >
> > add/remove: 1/1 grow/shrink: 1/3 up/down: 267/-295 (-28)
> > function old new delta
> > free_hot_cold_page_list - 264 +264
> > get_page_from_freelist 2129 2132 +3
> > pagevec_free 243 239 -4
> > split_free_page 380 373 -7
> > release_pages 606 510 -96
> > free_page_list 188 - -188
> >
> > Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
> > ---
> > include/linux/gfp.h | 1 +
> > mm/page_alloc.c | 12 ++++++++++++
> > mm/swap.c | 14 +++-----------
> > mm/vmscan.c | 20 +-------------------
> > 4 files changed, 17 insertions(+), 30 deletions(-)
> >
> > diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> > index cb40892..dd7b9cc 100644
> > --- a/include/linux/gfp.h
> > +++ b/include/linux/gfp.h
> > @@ -358,6 +358,7 @@ void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
> > extern void free_pages(struct page *page, unsigned int order);
> > extern void free_pages(unsigned long addr, unsigned int order);
> > extern void free_hot_cold_page(struct page *page, int cold);
> > +extern void free_hot_cold_page_list(struct list_head *list, int cold);
> >
> > #define free_page(page) free_pages((page), 0)
> > #define free_page(addr) free_pages((addr), 0)
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 1dbcf88..af486e4 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -1209,6 +1209,18 @@ out:
> > local_irq_restore(flags);
> > }
> >
> > +void free_hot_cold_page_list(struct list_head *list, int cold)
> > +{
> > + struct page *page, *next;
> > +
> > + list_for_each_entry_safe(page, next, list, lru) {
> > + trace_mm_pagevec_free(page, cold);
>
>
> I understand you want to minimize changes without breaking current ABI
> with trace tools.
> But apparently, It's not a pagvec_free. It just hurts readability.
> As I take a look at the code, mm_pagevec_free isn't related to pagevec
> but I guess it can represent 0-order pages free because 0-order pages
> are freed only by pagevec until now.
> So, how about renaming it with mm_page_free or mm_page_free_zero_order?
> If you do, you need to do s/MM_PAGEVEC_FREE/MM_FREE_FREE/g in
> trace-pagealloc-postprocess.pl.
>
>
> > + free_hot_cold_page(page, cold);
> > + }
> > +
> > + INIT_LIST_HEAD(list);
>
> Why do we need it?
My email has been horrid for a couple of months (fixed now), so I might
have missed any reply to Minchin's review comments?
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