Eric Lee / linux-smarc-t335x-v3.2

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Commit 7278c9c19bd85cf33213a2e0b538a18d3ac8ad00

Authored by Gui Jianfeng
Committed by Jens Axboe
1 parent a8adbe378b
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

cfq-iosched: don't check cfqg in choose_service_tree() 

When cfq_choose_cfqg() is called in select_queue(), there must be at least one
backlogged CFQ queue waiting for dispatching, hence there must be at least one
backlogged CFQ group on service tree. So we never call choose_service_tree()
with cfqg == NULL.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

Showing 1 changed file with 0 additions and 6 deletions Side-by-side Diff

... ... @@ -2103,12 +2103,6 @@
2103 2103 unsigned group_slice;
2104 2104 enum wl_prio_t original_prio = cfqd->serving_prio;
2105 2105  
2106   - if (!cfqg) {
2107   - cfqd->serving_prio = IDLE_WORKLOAD;
2108   - cfqd->workload_expires = jiffies + 1;
2109   - return;
2110   - }
2111   -
2112 2106 /* Choose next priority. RT > BE > IDLE */
2113 2107 if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg))
2114 2108 cfqd->serving_prio = RT_WORKLOAD;