elflink: Reduce the shared mapping to filesz + non-zero BSS. This should
decrease the number of huge pages we reserve.
Signed-off-by: Steve Fox <[EMAIL PROTECTED]>
---
This is unchanged from the earlier submission, but it has been regression
tested now.
diff --git a/elflink.c b/elflink.c
index 41a1fe9..9225010 100644
--- a/elflink.c
+++ b/elflink.c
@@ -393,7 +393,15 @@ static int prepare_segment(struct seg_in
int hpage_size = gethugepagesize();
void *p, *extra_start, *extra_end;
unsigned long gap;
- unsigned long size = ALIGN(seg->memsz, hpage_size);
+ unsigned long size;
+
+ /*
+ * Calculate the BSS size that we must copy in order to minimize
+ * the size of the shared mapping.
+ */
+ get_extracopy(seg, &extra_start, &extra_end);
+ size = ALIGN((unsigned long)extra_end - (unsigned long)seg->vaddr,
+ hpage_size);
/* Prepare the hugetlbfs file */
@@ -416,7 +424,6 @@ static int prepare_segment(struct seg_in
memcpy(p, seg->vaddr, seg->filesz);
DEBUG_CONT("done\n");
- get_extracopy(seg, &extra_start, &extra_end);
if (extra_end > extra_start) {
DEBUG("Copying extra %#0lx bytes from %p...\n",
(unsigned long)(extra_end - extra_start), extra_start);
--
Steve Fox
IBM Linux Technology Center
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