Re: [PATCH for-next 00/32] spin lock usage optimization for SCSI drivers
From: tanxiaofei <hidden>
Date: 2021-02-09 02:02:12
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Hi Finn, Thanks for reviewing the patch set. On 2021/2/8 15:57, Finn Thain wrote:
On Sun, 7 Feb 2021, Xiaofei Tan wrote:quoted
Replace spin_lock_irqsave with spin_lock in hard IRQ of SCSI drivers. There are no function changes, but may speed up if interrupt happen too often.This change doesn't necessarily work on platforms that support nested interrupts.
Linux doesn't support nested interrupts anymore after the following patch, so please don't worry this. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e58aa3d2d0cc
Were you able to measure any benefit from this change on some other platform?
It's hard to measure the benefit of this change. Hmm, you could take this patch set as cleanup. thanks.
Please see also, https://lore.kernel.org/linux-scsi/89c5cb05cb844939ae684db0077f675f@h3c.com/ (local) .