Commit dc60a408 authored by Bart Van Assche's avatar Bart Van Assche Committed by Martin K. Petersen
Browse files

scsi: ufs: core: Improve IOPS 



Measurements have shown that IOPS improve by 2% - 3% on my UFS 4 test
setup every time a ktime_get() call is removed from the UFS driver
command processing path. Hence this patch that modifies
ufshcd_clk_scaling_start_busy() such that ktime_get() is only called if
the returned value will be used.

Signed-off-by: default avatarBart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20250813171049.3399387-1-bvanassche@acm.org


Reviewed-by: default avatarBean Huo <beanhuo@micron.com>
Reviewed-by: default avatarPeter Wang <peter.wang@mediatek.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent da810279

drivers/ufs/core/ufshcd.c

+3 −1
Original line number Diff line number Diff line
@@ -2230,11 +2230,13 @@ static void ufshcd_exit_clk_gating(struct ufs_hba *hba) 
static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)

{

	bool queue_resume_work = false;

	ktime_t curr_t = ktime_get();

	ktime_t curr_t;



	if (!ufshcd_is_clkscaling_supported(hba))

		return;



	curr_t = ktime_get();



	guard(spinlock_irqsave)(&hba->clk_scaling.lock);



	if (!hba->clk_scaling.active_reqs++)