linux-kernel - Re: [PATCH] brd: detect zero writes for saving ram

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Message-ID: <CAC5umyhznnRTsAkwmK3xV_MGRZzsLw2sEiUjCP2Z_k9e3Nt8XQ@mail.gmail.com>
Date:	Sun, 8 Feb 2015 00:18:34 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	Nick Piggin <npiggin@...nel.dk>, Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] brd: detect zero writes for saving ram

2015-02-08 0:03 GMT+09:00 Akinobu Mita <akinobu.mita@...il.com>:
> This introduces a module parameter to detect zero writes and not to
> allocate memory.  Read requests for unallocated (unwritten) region
> end up by reading zero.  So this can save zeroed memory consumption
> with extra overhead for the detection.
>
> This feature is useful for testing filesystems and user programs to
> huge files without huge real storage.  So this change also extends
> the upper limit on the size of the RAM disk.

I have just noticed about zram and I'll check I can use it instead.
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