[PATCH 3/6] nvme: add per request retry timer

[Sagi Grimberg]

On 02/09/2026 16:41, Christoph Hellwig wrote:
> On Sun, Aug 23, 2026 at 11:48:59AM +0300, Sagi Grimberg wrote:
>> The existing command retry mechanism adds a request to retry
>> to a retry list and modifies a request-queue (controller) wide
>> dealyed queue timer.
>>
>> The issue is that the existing requests in this queue may wait
>> for longer periods of time as more requests are completed with
>> a retry crd level.
>>
>> Instead, add a per-request timer that will allow different
>> requests retry in a way that is independent of other requests.
> This blows every nvme_request.  I think we'd only need a per-CRD
> level retry list and timer, can't we do that instead?

I can't see how, because we'd be modifying the timer potentially 
indefinitely while
requests are pending....

I understand that this bloats the nvme_request, however this is not 
accessed in the hot path.