* CONFIG_UNIX98_PTY_COUNT and devfs
@ 2003-12-17 3:37 Frédéric L. W. Meunier
2003-12-18 3:24 ` H. Peter Anvin
0 siblings, 1 reply; 2+ messages in thread
From: Frédéric L. W. Meunier @ 2003-12-17 3:37 UTC (permalink / raw)
To: linux-kernel
I used CONFIG_UNIX98_PTY_COUNT=32 and it created
/dev/pty/m[0-255]. Is there any way to make devfs only create
/dev/pty/m[0-31] ?
>From Configure.help:
"When not in use, each additional set of 256 PTYs occupy
approximately 8 KB of kernel memory on 32-bit architectures."
Does that mean it doesn't make any difference if I set
CONFIG_UNIX98_PTY_COUNT=1 or CONFIG_UNIX98_PTY_COUNT=256, and
ONFIG_UNIX98_PTY_COUNT=257 will create 512 entries ?
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: CONFIG_UNIX98_PTY_COUNT and devfs
2003-12-17 3:37 CONFIG_UNIX98_PTY_COUNT and devfs Frédéric L. W. Meunier
@ 2003-12-18 3:24 ` H. Peter Anvin
0 siblings, 0 replies; 2+ messages in thread
From: H. Peter Anvin @ 2003-12-18 3:24 UTC (permalink / raw)
To: linux-kernel
Followup to: <Pine.LNX.4.58.0312170131500.397@pervalidus.dyndns.org>
By author: =?ISO-8859-1?Q?Fr=E9d=E9ric_L=2E_W=2E_Meunier?= <1@pervalidus.net>
In newsgroup: linux.dev.kernel
>
> I used CONFIG_UNIX98_PTY_COUNT=32 and it created
> /dev/pty/m[0-255]. Is there any way to make devfs only create
> /dev/pty/m[0-31] ?
>
> From Configure.help:
>
> "When not in use, each additional set of 256 PTYs occupy
> approximately 8 KB of kernel memory on 32-bit architectures."
>
> Does that mean it doesn't make any difference if I set
> CONFIG_UNIX98_PTY_COUNT=1 or CONFIG_UNIX98_PTY_COUNT=256, and
> ONFIG_UNIX98_PTY_COUNT=257 will create 512 entries ?
>
This has absolutely nothing to do with devfs, but Unix98 PTYs
currently come in packs of 256.
-hpa
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