32 lines
1.1 KiB
Diff
32 lines
1.1 KiB
Diff
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From 7c371e7de53554166711e0bcc37df94d0a78edd3 Mon Sep 17 00:00:00 2001
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From: sangyan <sangyan@huawei.com>
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Date: Fri, 21 Apr 2017 14:35:03 +0800
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Subject: [PATCH] elflink.c: remap segments with MAP_SHARED flag
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Mmapping segment with MAP_PRIVATE will create a private
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copy-on-write mapping, as a result updates to the mapping
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will cost extra pages. It will cost double number of pages
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in the worst case, so we change to MAP_SHARED flag.
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It is also safe to mmap a unlinked file or a read-only file.
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---
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elflink.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/elflink.c b/elflink.c
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index b746b26..8187ee0 100644
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--- a/elflink.c
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+++ b/elflink.c
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@@ -1131,7 +1131,7 @@ static void remap_segments(struct seg_info *seg, int num)
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start = ALIGN_DOWN((unsigned long)seg[i].vaddr, hpage_size);
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offset = (unsigned long)(seg[i].vaddr - start);
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mapsize = ALIGN(offset + seg[i].memsz, hpage_size);
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- mmap_flags = MAP_PRIVATE|MAP_FIXED;
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+ mmap_flags = MAP_SHARED|MAP_FIXED;
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/* If requested, make no reservations */
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if (__hugetlb_opts.no_reserve)
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--
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1.8.3.1
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