From: Christoph Hellwig <hch@infradead.org>
To: Adrian Hunter <adrian.hunter@nokia.com>
Cc: Jens Axboe <axboe@kernel.dk>,
Andrew Morton <akpm@linux-foundation.org>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 1/4] block: Allow drivers to implement BLKDISCARD and add BLKSECDISCARD
Date: Thu, 10 Jun 2010 04:19:50 -0400 [thread overview]
Message-ID: <20100610081950.GA15888@infradead.org> (raw)
In-Reply-To: <4C081AEC.7010302@nokia.com>
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.
next prev parent reply other threads:[~2010-06-10 8:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-03 21:13 [PATCH 1/4] block: Allow drivers to implement BLKDISCARD and add BLKSECDISCARD Adrian Hunter
2010-06-10 6:58 ` Adrian Hunter
2010-06-10 8:19 ` Christoph Hellwig [this message]
2010-06-11 7:52 ` Kyungmin Park
2010-06-11 7:52 ` Kyungmin Park
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