linux-kernel - Re: [PATCH 1/4] block: Allow drivers to implement BLKDISCARD and add BLKSECDISCARD

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Date:	Thu, 10 Jun 2010 04:19:50 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Adrian Hunter <adrian.hunter@...ia.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 1/4] block: Allow drivers to implement BLKDISCARD and add
 BLKSECDISCARD

On Fri, Jun 04, 2010 at 12:13:16AM +0300, Adrian Hunter wrote:
> SD/MMC cards provide an erase operation that is too inefficient to
> allow file systems to use it, however it is still useful for
> userspace tools because it is still 10 - 100 times faster than
> writing zeroes.  Allow the MMC block driver to provide its own
> BLKDISCARD implementation for this purpose.

That's no good reason.  Almost all current SSD TRIM implementations
have the same issue, that's why filesustems require the -o discard
option to enabled it.  In addition I've not actually seen any numbers
from you on a current kernel.

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