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-rw-r--r--drivers/md/dm-kcopyd.c34
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;