From f56dd32bf7c5b8a8cf35984f39f1a253b75945ff Mon Sep 17 00:00:00 2001 From: Davi Arnaut Date: Thu, 8 Jul 2010 18:20:08 -0300 Subject: Bug#34043: Server loops excessively in _checkchunk() when safemalloc is enabled Essentially, the problem is that safemalloc is excruciatingly slow as it checks all allocated blocks for overrun at each memory management primitive, yielding a almost exponential slowdown for the memory management functions (malloc, realloc, free). The overrun check basically consists of verifying some bytes of a block for certain magic keys, which catches some simple forms of overrun. Another minor problem is violation of aliasing rules and that its own internal list of blocks is prone to corruption. Another issue with safemalloc is rather the maintenance cost as the tool has a significant impact on the server code. Given the magnitude of memory debuggers available nowadays, especially those that are provided with the platform malloc implementation, maintenance of a in-house and largely obsolete memory debugger becomes a burden that is not worth the effort due to its slowness and lack of support for detecting more common forms of heap corruption. Since there are third-party tools that can provide the same functionality at a lower or comparable performance cost, the solution is to simply remove safemalloc. Third-party tools can provide the same functionality at a lower or comparable performance cost. The removal of safemalloc also allows a simplification of the malloc wrappers, removing quite a bit of kludge: redefinition of my_malloc, my_free and the removal of the unused second argument of my_free. Since free() always check whether the supplied pointer is null, redudant checks are also removed. Also, this patch adds unit testing for my_malloc and moves my_realloc implementation into the same file as the other memory allocation primitives. client/mysqldump.c: Pass my_free directly as its signature is compatible with the callback type -- which wasn't the case for free_table_ent. --- plugin/daemon_example/daemon_example.cc | 2 +- plugin/semisync/semisync_master.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'plugin') diff --git a/plugin/daemon_example/daemon_example.cc b/plugin/daemon_example/daemon_example.cc index 43138f0655f..9bdacdfeae9 100644 --- a/plugin/daemon_example/daemon_example.cc +++ b/plugin/daemon_example/daemon_example.cc @@ -175,7 +175,7 @@ static int daemon_example_plugin_deinit(void *p) my_write(con->heartbeat_file, (uchar*) buffer, strlen(buffer), MYF(0)); my_close(con->heartbeat_file, MYF(0)); - my_free((char *)con, MYF(0)); + my_free(con); DBUG_RETURN(0); } diff --git a/plugin/semisync/semisync_master.h b/plugin/semisync/semisync_master.h index 1a562e8bb77..dfadf85f271 100644 --- a/plugin/semisync/semisync_master.h +++ b/plugin/semisync/semisync_master.h @@ -255,7 +255,7 @@ private: */ void free_block(Block *block) { - my_free(block, MYF(0)); + my_free(block); --block_num; } -- cgit v1.2.1