From: David Laight <David.Laight@ACULAB.COM>
To: 'Hans Verkuil' <hverkuil-cisco@xs4all.nl>,
'Laurent Pinchart' <laurent.pinchart@ideasonboard.com>,
Benjamin Gaignard <benjamin.gaignard@collabora.com>
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Subject: RE: [RFC 2/4] media: videobuf2: Replace bufs array by a list
Date: Tue, 14 Mar 2023 10:11:07 +0000 [thread overview]
Message-ID: <dc04d48e34ed40e58f43badd001a81d0@AcuMS.aculab.com> (raw)
In-Reply-To: <e704b505-86d8-c6f2-8546-adccdab72622@xs4all.nl>
From: Hans Verkuil
> Sent: 14 March 2023 08:55
...
> Why not start with a dynamically allocated array of 32 vb2_buffer pointers?
> And keep doubling the size (reallocing) whenever more buffers are needed,
> up to some maximum (1024 would be a good initial value for that, I think).
> This max could be even a module option.
I don't know the typical uses (or the code at all).
But it might be worth having a small array in the structure itself.
Useful if there are typically always (say) less than 8 buffers.
For larger sizes use the (IIRC) kmalloc_size() to find the actual
size of the structure that will be allocate and set the array
size appropriately.
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2023-03-14 10:21 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-13 13:59 [RFC 0/4] Allow more than 32 vb2 buffers per queue Benjamin Gaignard
2023-03-13 13:59 ` [RFC 1/4] media: videobuf2: Use vb2_get_buffer() as helper everywhere Benjamin Gaignard
2023-03-13 16:51 ` Andrzej Pietrasiewicz
2023-03-13 16:56 ` Benjamin Gaignard
2023-03-13 18:01 ` Laurent Pinchart
2023-03-13 18:04 ` Laurent Pinchart
2023-03-13 13:59 ` [RFC 2/4] media: videobuf2: Replace bufs array by a list Benjamin Gaignard
2023-03-13 18:11 ` Laurent Pinchart
2023-03-13 23:16 ` David Laight
2023-03-14 8:55 ` Hans Verkuil
2023-03-14 10:11 ` David Laight [this message]
2023-03-14 10:42 ` Hans Verkuil
2023-03-19 23:33 ` Laurent Pinchart
2023-03-22 14:50 ` Nicolas Dufresne
2023-03-22 15:01 ` Laurent Pinchart
2023-03-24 15:14 ` Nicolas Dufresne
2023-03-24 15:18 ` Hans Verkuil
2023-03-24 15:34 ` Nicolas Dufresne
2023-03-24 20:21 ` Laurent Pinchart
2023-03-15 13:57 ` Nicolas Dufresne
2023-03-19 23:33 ` Laurent Pinchart
2023-03-13 13:59 ` [RFC 3/4] media: videobuf2: Use bitmap to manage vb2 index Benjamin Gaignard
2023-03-13 18:14 ` Laurent Pinchart
2023-03-14 2:10 ` [EXT] " Ming Qian
2023-03-13 13:59 ` [RFC 4/4] media: videobuf2: Stop define VB2_MAX_FRAME as global Benjamin Gaignard
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