From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx111.postini.com [74.125.245.111]) by kanga.kvack.org (Postfix) with SMTP id 2ED1D6B0032 for ; Tue, 16 Jul 2013 09:03:03 -0400 (EDT) Received: by mail-pb0-f42.google.com with SMTP id un1so679670pbc.15 for ; Tue, 16 Jul 2013 06:03:02 -0700 (PDT) Message-ID: <51E5447D.70901@gmail.com> Date: Tue, 16 Jul 2013 21:02:53 +0800 From: Sam Ben MIME-Version: 1.0 Subject: Re: [RFC 2/4] Have __free_pages_memory() free in larger chunks. References: <1373594635-131067-1-git-send-email-holt@sgi.com> <1373594635-131067-3-git-send-email-holt@sgi.com> In-Reply-To: <1373594635-131067-3-git-send-email-holt@sgi.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Robin Holt Cc: "H. Peter Anvin" , Ingo Molnar , Nate Zimmer , Linux Kernel , Linux MM , Rob Landley , Mike Travis , Daniel J Blueman , Andrew Morton , Greg KH , Yinghai Lu , Mel Gorman Hi Robin, On 07/12/2013 10:03 AM, Robin Holt wrote: > Currently, when free_all_bootmem() calls __free_pages_memory(), the > number of contiguous pages that __free_pages_memory() passes to the > buddy allocator is limited to BITS_PER_LONG. In order to be able to I fail to understand this. Why the original page number is BITS_PER_LONG? > free only the first page of a 2MiB chunk, we need that to be increased > to PTRS_PER_PMD. > > Signed-off-by: Robin Holt > Signed-off-by: Nate Zimmer > To: "H. Peter Anvin" > To: Ingo Molnar > Cc: Linux Kernel > Cc: Linux MM > Cc: Rob Landley > Cc: Mike Travis > Cc: Daniel J Blueman > Cc: Andrew Morton > Cc: Greg KH > Cc: Yinghai Lu > Cc: Mel Gorman > --- > mm/nobootmem.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/mm/nobootmem.c b/mm/nobootmem.c > index bdd3fa2..3b512ca 100644 > --- a/mm/nobootmem.c > +++ b/mm/nobootmem.c > @@ -83,10 +83,10 @@ void __init free_bootmem_late(unsigned long addr, unsigned long size) > static void __init __free_pages_memory(unsigned long start, unsigned long end) > { > unsigned long i, start_aligned, end_aligned; > - int order = ilog2(BITS_PER_LONG); > + int order = ilog2(max(BITS_PER_LONG, PTRS_PER_PMD)); > > - start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1); > - end_aligned = end & ~(BITS_PER_LONG - 1); > + start_aligned = (start + ((1UL << order) - 1)) & ~((1UL << order) - 1); > + end_aligned = end & ~((1UL << order) - 1); > > if (end_aligned <= start_aligned) { > for (i = start; i < end; i++) > @@ -98,7 +98,7 @@ static void __init __free_pages_memory(unsigned long start, unsigned long end) > for (i = start; i < start_aligned; i++) > __free_pages_bootmem(pfn_to_page(i), 0); > > - for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG) > + for (i = start_aligned; i < end_aligned; i += 1 << order) > __free_pages_bootmem(pfn_to_page(i), order); > > for (i = end_aligned; i < end; i++) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org