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[Bug malloc/19048] malloc: arena free list can become cyclic, increasing contention
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 28 Oct 2015 20:37:04 +0000
- Subject: [Bug malloc/19048] malloc: arena free list can become cyclic, increasing contention
- Auto-submitted: auto-generated
- References: <bug-19048-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19048
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a62719ba90e2fa1728890ae7dc8df9e32a622e7b
commit a62719ba90e2fa1728890ae7dc8df9e32a622e7b
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed Oct 28 19:32:46 2015 +0100
malloc: Prevent arena free_list from turning cyclic [BZ #19048]
[BZ# 19048]
* malloc/malloc.c (struct malloc_state): Update comment. Add
attached_threads member.
(main_arena): Initialize attached_threads.
* malloc/arena.c (list_lock): Update comment.
(ptmalloc_lock_all, ptmalloc_unlock_all): Likewise.
(ptmalloc_unlock_all2): Reinitialize arena reference counts.
(deattach_arena): New function.
(_int_new_arena): Initialize arena reference count and deattach
replaced arena.
(get_free_list, reused_arena): Update reference count and deattach
replaced arena.
(arena_thread_freeres): Update arena reference count and only put
unreferenced arenas on the free list.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 17 +++++++++++++
NEWS | 15 +++++++++--
malloc/arena.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++----
malloc/malloc.c | 11 +++++++-
4 files changed, 103 insertions(+), 10 deletions(-)
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