Messages in this thread |  | | Subject | Re: [PATCH for-next 00/32] spin lock usage optimization for SCSI drivers | From | tanxiaofei <> | Date | Tue, 9 Feb 2021 10:00:22 +0800 |
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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: > >> 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/ > > . >
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