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* Is there a memory block device?
@ 2008-02-26 18:53 rzryyvzy
  2008-02-26 19:07 ` Valdis.Kletnieks
  2008-02-26 19:49 ` Sven-Haegar Koch
  0 siblings, 2 replies; 3+ messages in thread
From: rzryyvzy @ 2008-02-26 18:53 UTC (permalink / raw)
  To: linux-kernel

I know that tmpfs is a memmory filesystem. Is there a possibility to create also a memory block device?
Is there a possibility to create for example a 1 GB memory block device (from the RAM)?

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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: Is there a memory block device?
  2008-02-26 18:53 Is there a memory block device? rzryyvzy
@ 2008-02-26 19:07 ` Valdis.Kletnieks
  2008-02-26 19:49 ` Sven-Haegar Koch
  1 sibling, 0 replies; 3+ messages in thread
From: Valdis.Kletnieks @ 2008-02-26 19:07 UTC (permalink / raw)
  To: rzryyvzy; +Cc: linux-kernel

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On Tue, 26 Feb 2008 19:53:36 +0100, rzryyvzy said:
> I know that tmpfs is a memmory filesystem. Is there a possibility to create also a memory block device?
> Is there a possibility to create for example a 1 GB memory block device (from the RAM)?

A better question would be:

What problem are you trying to solve by ysing a "memory block device"?  There
may well be other approaches that would work better, but it's hard to say.
Are you trying to avoid the buffer cache pool?  Ensure pages are in physical
memory? Or some other problem?

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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: Is there a memory block device?
  2008-02-26 18:53 Is there a memory block device? rzryyvzy
  2008-02-26 19:07 ` Valdis.Kletnieks
@ 2008-02-26 19:49 ` Sven-Haegar Koch
  1 sibling, 0 replies; 3+ messages in thread
From: Sven-Haegar Koch @ 2008-02-26 19:49 UTC (permalink / raw)
  To: rzryyvzy; +Cc: linux-kernel

On Tue, 26 Feb 2008, rzryyvzy wrote:

> I know that tmpfs is a memmory filesystem. Is there a possibility to 
> create also a memory block device?
> Is there a possibility to create for example a 1 GB memory block device 
> (from the RAM)?

There are the /dev/ram* devices, created through kernel config 
CONFIG_BLK_DEV_RAM (RAM disk support), kernel module rd.ko

But I'm not sure how to configure their size besides setting the kernel 
config option, it's a long time ago that I used them last.

c'ya
sven

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^ permalink raw reply	[flat|nested] 3+ messages in thread

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2008-02-26 18:53 Is there a memory block device? rzryyvzy
2008-02-26 19:07 ` Valdis.Kletnieks
2008-02-26 19:49 ` Sven-Haegar Koch

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