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| author | Mike Miller <mike.miller@hp.com> | 2005-09-13 10:25:22 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-13 17:22:30 +0200 |
| commit | 33079b21978f478865068ee6a3c5807b6c6ecdbe (patch) | |
| tree | 086035c299e4dcc0ab6af6623c53ac72be81b303 /drivers/block/cciss_cmd.h | |
| parent | [PATCH] cciss: new disk register/deregister routines (diff) | |
| download | linux-33079b21978f478865068ee6a3c5807b6c6ecdbe.tar.xz linux-33079b21978f478865068ee6a3c5807b6c6ecdbe.zip | |
[PATCH] cciss: direct lookup for command completions
This patch changes the way we complete commands. In the old method when we
got a completion we searched our command list from the top until we find it.
This method uses a tag associated with each command (not SCSI command tagging)
to index us directly to the completed command. This helps performance.
Signed-off-by: Don Brace <dab@hp.com>
Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/block/cciss_cmd.h')
| -rw-r--r-- | drivers/block/cciss_cmd.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/block/cciss_cmd.h b/drivers/block/cciss_cmd.h index a88a88817623..53fea549ba8b 100644 --- a/drivers/block/cciss_cmd.h +++ b/drivers/block/cciss_cmd.h @@ -226,6 +226,10 @@ typedef struct _ErrorInfo_struct { #define CMD_MSG_DONE 0x04 #define CMD_MSG_TIMEOUT 0x05 +/* This structure needs to be divisible by 8 for new + * indexing method. + */ +#define PADSIZE (sizeof(long) - 4) typedef struct _CommandList_struct { CommandListHeader_struct Header; RequestBlock_struct Request; @@ -236,14 +240,14 @@ typedef struct _CommandList_struct { ErrorInfo_struct * err_info; /* pointer to the allocated mem */ int ctlr; int cmd_type; + long cmdindex; struct _CommandList_struct *prev; struct _CommandList_struct *next; struct request * rq; struct completion *waiting; int retry_count; -#ifdef CONFIG_CISS_SCSI_TAPE void * scsi_cmd; -#endif + char pad[PADSIZE]; } CommandList_struct; //Configuration Table Structure |