diff options
| -rw-r--r-- | drivers/md/dm-kcopyd.c | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c index 671c24332802..df2011de7be2 100644 --- a/drivers/md/dm-kcopyd.c +++ b/drivers/md/dm-kcopyd.c @@ -28,10 +28,27 @@ #include "dm-core.h" -#define SUB_JOB_SIZE 128 #define SPLIT_COUNT 8 #define MIN_JOBS 8 -#define RESERVE_PAGES (DIV_ROUND_UP(SUB_JOB_SIZE << SECTOR_SHIFT, PAGE_SIZE)) + +#define DEFAULT_SUB_JOB_SIZE_KB 512 +#define MAX_SUB_JOB_SIZE_KB 1024 + +static unsigned kcopyd_subjob_size_kb = DEFAULT_SUB_JOB_SIZE_KB; + +module_param(kcopyd_subjob_size_kb, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(kcopyd_subjob_size_kb, "Sub-job size for dm-kcopyd clients"); + +static unsigned dm_get_kcopyd_subjob_size(void) +{ + unsigned sub_job_size_kb; + + sub_job_size_kb = __dm_get_module_param(&kcopyd_subjob_size_kb, + DEFAULT_SUB_JOB_SIZE_KB, + MAX_SUB_JOB_SIZE_KB); + + return sub_job_size_kb << 1; +} /*----------------------------------------------------------------- * Each kcopyd client has its own little pool of preallocated @@ -41,6 +58,7 @@ struct dm_kcopyd_client { struct page_list *pages; unsigned nr_reserved_pages; unsigned nr_free_pages; + unsigned sub_job_size; struct dm_io_client *io_client; @@ -693,8 +711,8 @@ static void segment_complete(int read_err, unsigned long write_err, progress = job->progress; count = job->source.count - progress; if (count) { - if (count > SUB_JOB_SIZE) - count = SUB_JOB_SIZE; + if (count > kc->sub_job_size) + count = kc->sub_job_size; job->progress += count; } @@ -821,7 +839,7 @@ void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from, job->master_job = job; job->write_offset = 0; - if (job->source.count <= SUB_JOB_SIZE) + if (job->source.count <= kc->sub_job_size) dispatch_job(job); else { job->progress = 0; @@ -888,6 +906,7 @@ int kcopyd_cancel(struct kcopyd_job *job, int block) struct dm_kcopyd_client *dm_kcopyd_client_create(struct dm_kcopyd_throttle *throttle) { int r; + unsigned reserve_pages; struct dm_kcopyd_client *kc; kc = kzalloc(sizeof(*kc), GFP_KERNEL); @@ -912,9 +931,12 @@ struct dm_kcopyd_client *dm_kcopyd_client_create(struct dm_kcopyd_throttle *thro goto bad_workqueue; } + kc->sub_job_size = dm_get_kcopyd_subjob_size(); + reserve_pages = DIV_ROUND_UP(kc->sub_job_size << SECTOR_SHIFT, PAGE_SIZE); + kc->pages = NULL; kc->nr_reserved_pages = kc->nr_free_pages = 0; - r = client_reserve_pages(kc, RESERVE_PAGES); + r = client_reserve_pages(kc, reserve_pages); if (r) goto bad_client_pages; |