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scsi: ufs: core: Improve IOPS

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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: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20250813171049.3399387-1-bvanassche@acm.org
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche
2025-08-18 21:59:42 -04:00
committed by Martin K. Petersen
parent da81027950
commit dc60a408a1
1 changed files with 3 additions and 1 deletions
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drivers/ufs/core/ufshcd.c
+3 -1
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@@ -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++)