linux-kernel - Re: [PATCH v2 1/2] USB: core: add a memory pool to urb for host-controller private data

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Message-ID: <29cc1ccb-4922-43fe-8d63-bc8333cc6049@suse.com>
Date: Wed, 14 May 2025 13:27:19 +0200
From: Oliver Neukum <oneukum@...e.com>
To: Alan Stern <stern@...land.harvard.edu>, David Wang <00107082@....com>
Cc: mathias.nyman@...el.com, gregkh@...uxfoundation.org, oneukum@...e.com,
 linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] USB: core: add a memory pool to urb for
 host-controller private data

On 13.05.25 16:25, Alan Stern wrote:
  
> Instead of having an URB keep ownership of its extra memory after it
> completes, xhci-hcd can put the memory area onto a free list.  Then
> memory areas on the free list can be reused with almost no overhead when
> URBs are enqueued later on.

The number of URBs in flight is basically unlimited.
When would you shrink the number of cached privates?
That would seem to be the basic question if you do
not link this with URBs.

	Regards
		Oliver