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| author | Shaohua Li <shaohua.li@intel.com> | 2012-12-15 22:35:23 -0800 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-13 13:13:22 +0200 |
| commit | 4d4ba298b996753a9391c03c77f6dd91dc0ac6a5 (patch) | |
| tree | be75b3d8355b19721053c5e60388e71427cc4d7c | |
| parent | d26e9b920088e4ad42f0a3b491adc6af4138019d (diff) | |
| download | android_kernel_m2note-4d4ba298b996753a9391c03c77f6dd91dc0ac6a5.tar.gz | |
block: fiops sync/async scale
CFQ gives 2.5 times more share to sync workload. This matches CFQ.
Note this is different with the read/write scale. We have 3 types of
requests:
1. read
2. sync write
3. write
CFQ doesn't differentitate type 1 and 2, but request cost of 1 and 2
are usually different for flash based storage. So we have both sync/async
and read/write scale here.
Change-Id: I3b36c94ba63df6d7a823c941a34a479da6243f20
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
| -rw-r--r-- | block/fiops-iosched.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/block/fiops-iosched.c b/block/fiops-iosched.c index bff327c11..3c6c498f7 100644 --- a/block/fiops-iosched.c +++ b/block/fiops-iosched.c @@ -17,6 +17,8 @@ #define VIOS_READ_SCALE (1) #define VIOS_WRITE_SCALE (1) +#define VIOS_SYNC_SCALE (2) +#define VIOS_ASYNC_SCALE (5) struct fiops_rb_root { struct rb_root rb; @@ -39,6 +41,8 @@ struct fiops_data { unsigned int read_scale; unsigned int write_scale; + unsigned int sync_scale; + unsigned int async_scale; }; struct fiops_ioc { @@ -291,6 +295,9 @@ static u64 fiops_scaled_vios(struct fiops_data *fiopsd, if (rq_data_dir(rq) == WRITE) vios = vios * fiopsd->write_scale / fiopsd->read_scale; + if (!rq_is_sync(rq)) + vios = vios * fiopsd->async_scale / fiopsd->sync_scale; + return vios; } @@ -513,6 +520,8 @@ static void *fiops_init_queue(struct request_queue *q) fiopsd->read_scale = VIOS_READ_SCALE; fiopsd->write_scale = VIOS_WRITE_SCALE; + fiopsd->sync_scale = VIOS_SYNC_SCALE; + fiopsd->async_scale = VIOS_ASYNC_SCALE; return fiopsd; } @@ -557,6 +566,8 @@ static ssize_t __FUNC(struct elevator_queue *e, char *page) \ } SHOW_FUNCTION(fiops_read_scale_show, fiopsd->read_scale); SHOW_FUNCTION(fiops_write_scale_show, fiopsd->write_scale); +SHOW_FUNCTION(fiops_sync_scale_show, fiopsd->sync_scale); +SHOW_FUNCTION(fiops_async_scale_show, fiopsd->async_scale); #undef SHOW_FUNCTION #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \ @@ -574,6 +585,8 @@ static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) } STORE_FUNCTION(fiops_read_scale_store, &fiopsd->read_scale, 1, 100); STORE_FUNCTION(fiops_write_scale_store, &fiopsd->write_scale, 1, 100); +STORE_FUNCTION(fiops_sync_scale_store, &fiopsd->sync_scale, 1, 100); +STORE_FUNCTION(fiops_async_scale_store, &fiopsd->async_scale, 1, 100); #undef STORE_FUNCTION #define FIOPS_ATTR(name) \ @@ -582,6 +595,8 @@ STORE_FUNCTION(fiops_write_scale_store, &fiopsd->write_scale, 1, 100); static struct elv_fs_entry fiops_attrs[] = { FIOPS_ATTR(read_scale), FIOPS_ATTR(write_scale), + FIOPS_ATTR(sync_scale), + FIOPS_ATTR(async_scale), __ATTR_NULL }; |