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-rw-r--r--debian/patches/no-brk-caching.diff47
1 files changed, 47 insertions, 0 deletions
diff --git a/debian/patches/no-brk-caching.diff b/debian/patches/no-brk-caching.diff
new file mode 100644
index 0000000..dc4ba85
--- /dev/null
+++ b/debian/patches/no-brk-caching.diff
@@ -0,0 +1,47 @@
+# DP: Don't cache the value of brk between sbrk calls.
+
+--- a/lib/malloc/malloc.c
++++ b/lib/malloc/malloc.c
+@@ -227,8 +227,6 @@
+ static int pagebucket; /* bucket for requests a page in size */
+ static int maxbuck; /* highest bucket receiving allocation request. */
+
+-static char *memtop; /* top of heap */
+-
+ static const unsigned long binsizes[NBUCKETS] = {
+ 8UL, 16UL, 32UL, 64UL, 128UL, 256UL, 512UL, 1024UL, 2048UL, 4096UL,
+ 8192UL, 16384UL, 32768UL, 65536UL, 131072UL, 262144UL, 524288UL,
+@@ -538,7 +536,6 @@
+ siz = binsize (nu);
+ /* Should check for errors here, I guess. */
+ sbrk (-siz);
+- memtop -= siz;
+
+ #ifdef MALLOC_STATS
+ _mstats.nsbrk++;
+@@ -633,8 +630,6 @@
+ if ((long)mp == -1)
+ goto morecore_done;
+
+- memtop += sbrk_amt;
+-
+ /* shouldn't happen, but just in case -- require 8-byte alignment */
+ if ((long)mp & MALIGN_MASK)
+ {
+@@ -684,7 +679,7 @@
+ Some of this partial page will be wasted space, but we'll use as
+ much as we can. Once we figure out how much to advance the break
+ pointer, go ahead and do it. */
+- memtop = curbrk = sbrk (0);
++ curbrk = sbrk (0);
+ sbrk_needed = pagesz - ((long)curbrk & (pagesz - 1)); /* sbrk(0) % pagesz */
+ if (sbrk_needed < 0)
+ sbrk_needed += pagesz;
+@@ -699,7 +694,6 @@
+ curbrk = sbrk (sbrk_needed);
+ if ((long)curbrk == -1)
+ return -1;
+- memtop += sbrk_needed;
+
+ /* Take the memory which would otherwise be wasted and populate the most
+ popular bin (2 == 32 bytes) with it. Add whatever we need to curbrk