From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 18 Dec 2025 09:15:38 +0000 (+0100)
Subject: malloc: Increase tcache fill count from 16 to 32
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fheads%2Ffw%2Fmalloc-batch-unsorted-basic;p=thirdparty%2Fglibc.git

malloc: Increase tcache fill count from 16 to 32

This avoids a regression in the omnetpp and xalancbmk benchmarks
of SPEC.  Apparently, these benchmarks are very sensitive to the
fill rate in malloc.

Suggested-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
Tested-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
---

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 3505158ac0..61be8fe6bb 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -306,7 +306,7 @@ verify (PTRDIFF_MAX <= SIZE_MAX / 2);
 
 /* This is another arbitrary limit, which tunables can change.  Each
    tcache bin will hold at most this number of chunks.  */
-# define TCACHE_FILL_COUNT 16
+# define TCACHE_FILL_COUNT 32
 
 /* Maximum chunks in tcache bins for tunables.  This value must fit the range
    of tcache->num_slots[] entries, else they may overflow.  */