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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2007-09-18 12:14:37 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:24:44 +0200 |
| commit | fd820f405574a30aacf9a859886e173d641f080b (patch) | |
| tree | fe257fa1705363bca29c9ad605b90f827c9d6e13 /drivers/scsi/scsi_lib.c | |
| parent | Fixup u14-34f ENABLE_SG_CHAINING (diff) | |
| download | linux-fd820f405574a30aacf9a859886e173d641f080b.tar.xz linux-fd820f405574a30aacf9a859886e173d641f080b.zip | |
revert sg segment size ifdefs
This reverts sg segment size ifdefs that the current code has in order
to provide a way to reduce sgpool memory consumption.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index b6e6d801768b..1a7e8d811a08 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -34,6 +34,13 @@ #define SG_MEMPOOL_NR ARRAY_SIZE(scsi_sg_pools) #define SG_MEMPOOL_SIZE 2 +/* + * The maximum number of SG segments that we will put inside a scatterlist + * (unless chaining is used). Should ideally fit inside a single page, to + * avoid a higher order allocation. + */ +#define SCSI_MAX_SG_SEGMENTS 128 + struct scsi_host_sg_pool { size_t size; char *name; @@ -45,9 +52,15 @@ struct scsi_host_sg_pool { static struct scsi_host_sg_pool scsi_sg_pools[] = { SP(8), SP(16), +#if (SCSI_MAX_SG_SEGMENTS > 16) SP(32), +#if (SCSI_MAX_SG_SEGMENTS > 32) SP(64), +#if (SCSI_MAX_SG_SEGMENTS > 64) SP(128), +#endif +#endif +#endif }; #undef SP @@ -685,13 +698,6 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int uptodate, } /* - * The maximum number of SG segments that we will put inside a scatterlist - * (unless chaining is used). Should ideally fit inside a single page, to - * avoid a higher order allocation. - */ -#define SCSI_MAX_SG_SEGMENTS 128 - -/* * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit * is totally arbitrary, a setting of 2048 will get you at least 8mb ios. */ @@ -708,15 +714,21 @@ static inline unsigned int scsi_sgtable_index(unsigned short nents) case 9 ... 16: index = 1; break; +#if (SCSI_MAX_SG_SEGMENTS > 16) case 17 ... 32: index = 2; break; +#if (SCSI_MAX_SG_SEGMENTS > 32) case 33 ... 64: index = 3; break; - case 65 ... SCSI_MAX_SG_SEGMENTS: +#if (SCSI_MAX_SG_SEGMENTS > 64) + case 65 ... 128: index = 4; break; +#endif +#endif +#endif default: printk(KERN_ERR "scsi: bad segment count=%d\n", nents); BUG(); |