Re: [PATCH 1/2] nvme: remove namespaces in parallel

From: Hannes Reinecke

Date: Mon Nov 02 2026 - 04:33:25 EST

On 11/2/26 9:00 AM, Qiliang Yuan wrote:
On Mon, 2 Nov 2026 08:26:57 +0100, Hannes Reinecke wrote:
On 11/2/26 7:14 AM, Qiliang Yuan wrote:
nvme_remove_namespaces() removes the namespaces of a controller one
after another. Each removal waits for RCU grace periods in
del_gendisk() for the namespace and for its multipath head, about
20 ms in all.

But that isn't changed by calling async_schedule_domain, isn't it?

Right, each removal still waits about 20 ms. What changes is that the
waits overlap. A grace period is system-wide, so removals that wait at
the same time are released by the same grace periods instead of each
needing its own. Disconnect time over tcp, from the table in the
patch:

So state that in the patch description.
That'll make it easier for people to understand.

Cheers,

Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
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