diff options
| author | unknown <istruewing@chilla.local> | 2007-02-13 16:33:32 +0100 |
|---|---|---|
| committer | unknown <istruewing@chilla.local> | 2007-02-13 16:33:32 +0100 |
| commit | ace7e53690c8af006b3854636b3d868c7e716374 (patch) | |
| tree | 3624dbef883bb35069c269aa1d2532c1812786b7 /include | |
| parent | c52165de13ca62c2a596ea05c01e07807432d605 (diff) | |
| download | mariadb-git-ace7e53690c8af006b3854636b3d868c7e716374.tar.gz | |
Bug#25460 - High concurrency MyISAM access causes severe mysqld crash.
Under high load it was possible that memory mapping was started on a table
while other threads were working with the table.
I fixed the start of memory mapping so that it is done at the first table
open or when the requesting thread is using the table exclusively only.
include/my_base.h:
Bug#25460 - High concurrency MyISAM access causes severe mysqld crash.
Added a new MyISAM open_flag HA_OPEN_MMAP.
storage/myisam/ha_myisam.cc:
Bug#25460 - High concurrency MyISAM access causes severe mysqld crash.
Replaced the call to mi_extra(... HA_EXTRA_MMAP ...) by the new open_flag
HA_OPEN_MMAP. This effects that the mapping will no longer be done on
every open of the table but just on the initial open, when the MyISAM
share is created.
storage/myisam/mi_dynrec.c:
Bug#25460 - High concurrency MyISAM access causes severe mysqld crash.
Added a comment with a concern regarding the mmap flag MAP_NORESERVE.
storage/myisam/mi_extra.c:
Bug#25460 - High concurrency MyISAM access causes severe mysqld crash.
Limited the start of memory mapping to situations where the requesting
thread has the table exclusively opened.
storage/myisam/mi_open.c:
Bug#25460 - High concurrency MyISAM access causes severe mysqld crash.
Added memory mapping code. Used if the new open_flag HA_OPEN_MMAP is set.
Diffstat (limited to 'include')
| -rw-r--r-- | include/my_base.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/my_base.h b/include/my_base.h index 14e4e3afb44..26d513ba2a7 100644 --- a/include/my_base.h +++ b/include/my_base.h @@ -47,6 +47,7 @@ #define HA_OPEN_ABORT_IF_CRASHED 16 #define HA_OPEN_FOR_REPAIR 32 /* open even if crashed */ #define HA_OPEN_FROM_SQL_LAYER 64 +#define HA_OPEN_MMAP 128 /* open memory mapped */ /* The following is parameter to ha_rkey() how to use key */ |