Add per-thread cache to malloc

* config.make.in: Enable experimental malloc option.
* configure.ac: Likewise.
* configure: Regenerate.
* manual/install.texi: Document it.
* INSTALL: Regenerate.
* malloc/Makefile: Likewise.
* malloc/malloc.c: Add per-thread cache (tcache).
(tcache_put): New.
(tcache_get): New.
(tcache_thread_freeres): New.
(tcache_init): New.
(__libc_malloc): Use cached chunks if available.
(__libc_free): Initialize tcache if needed.
(__libc_realloc): Likewise.
(__libc_calloc): Likewise.
(_int_malloc): Prefill tcache when appropriate.
(_int_free): Likewise.
(do_set_tcache_max): New.
(do_set_tcache_count): New.
(do_set_tcache_unsorted_limit): New.
* manual/probes.texi: Document new probes.
* malloc/arena.c: Add new tcache tunables.
* elf/dl-tunables.list: Likewise.
* manual/tunables.texi: Document them.
* NEWS: Mention the per-thread cache.

1 files changed, 12 insertions, 0 deletions

diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
index df4f9622b4..c188c6ad52 100644
--- a/elf/dl-tunables.list
+++ b/elf/dl-tunables.list
@@ -76,6 +76,18 @@ glibc {
       minval: 1
       security_level: SXID_IGNORE
     }
+    tcache_max {
+      type: SIZE_T
+      security_level: SXID_ERASE
+    }
+    tcache_count {
+      type: SIZE_T
+      security_level: SXID_ERASE
+    }
+    tcache_unsorted_limit {
+      type: SIZE_T
+      security_level: SXID_ERASE
+    }
   }
   tune {
     hwcap_mask {