Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932446Ab3GLCEM (ORCPT ); Thu, 11 Jul 2013 22:04:12 -0400 Received: from relay3.sgi.com ([192.48.152.1]:49204 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932556Ab3GLCEK (ORCPT ); Thu, 11 Jul 2013 22:04:10 -0400 From: Robin Holt To: "H. Peter Anvin" , Ingo Molnar Cc: Robin Holt , Nate Zimmer , Linux Kernel , Linux MM , Rob Landley , Mike Travis , Daniel J Blueman , Andrew Morton , Greg KH , Yinghai Lu , Mel Gorman Subject: [RFC 2/4] Have __free_pages_memory() free in larger chunks. Date: Thu, 11 Jul 2013 21:03:53 -0500 Message-Id: <1373594635-131067-3-git-send-email-holt@sgi.com> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1373594635-131067-1-git-send-email-holt@sgi.com> References: <1373594635-131067-1-git-send-email-holt@sgi.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2281 Lines: 58 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 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++) -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/