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MDEV-10814: Coredumps to exclude query cache (Linux)

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This only occurs non-DEBUG builds. Its main purpose is to
save space in the core dump from elements not usually useful.

Signed-off-by: Daniel Black <daniel@linux.vnet.ibm.com>
This commit is contained in:
Daniel Black
2017-04-25 17:49:15 +10:00
committed by Daniel Black
parent c029eae02d
commit 3188131b15
2 changed files with 19 additions and 1 deletions
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19
sql/sql_cache.cc
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@ -329,6 +329,9 @@ TODO list:
*/
#include "mariadb.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#if defined(DBUG_OFF) && defined(HAVE_MADVISE)
#include <sys/mman.h>
#endif
#include "sql_priv.h"
#include "sql_basic_types.h"
#include "sql_cache.h"
@ -2581,7 +2584,7 @@ ulong Query_cache::init_cache()
{
uint mem_bin_count, num, step;
ulong mem_bin_size, prev_size, inc;
ulong additional_data_size, max_mem_bin_size, approx_additional_data_size;
ulong max_mem_bin_size, approx_additional_data_size;
int align;
DBUG_ENTER("Query_cache::init_cache");
@ -2646,6 +2649,13 @@ ulong Query_cache::init_cache()
if (!(cache= (uchar *)
my_malloc_lock(query_cache_size+additional_data_size, MYF(0))))
goto err;
#if defined(DBUG_OFF) && defined(HAVE_MADVISE) && defined(MADV_DONTDUMP)
if (madvise(cache, query_cache_size+additional_data_size, MADV_DONTDUMP))
{
DBUG_PRINT("warning", ("coudn't mark query cache memory as MADV_DONTDUMP: %s",
strerror(errno)));
}
#endif
DBUG_PRINT("qcache", ("cache length %lu, min unit %lu, %u bins",
query_cache_size, min_allocation_unit, mem_bin_num));
@ -2797,6 +2807,13 @@ void Query_cache::free_cache()
} while (block != queries_blocks);
}
#if defined(DBUG_OFF) && defined(HAVE_MADVISE) && defined(MADV_DODUMP)
if (madvise(cache, query_cache_size+additional_data_size, MADV_DODUMP))
{
DBUG_PRINT("warning", ("coudn't mark query cache memory as MADV_DODUMP: %s",
strerror(errno)));
}
#endif
my_free(cache);
make_disabled();
my_hash_free(&queries);