linux-ext4 - Re: Please help: Is ext4 counting trims as writes, or is something killing my SSD?

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Message-ID: <20130912152845.GG12918@thunk.org>
Date:	Thu, 12 Sep 2013 11:28:45 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Julian Andres Klode <jak@...-linux.org>,
	Calvin Walton <calvin.walton@...stin.ca>,
	linux-ext4@...r.kernel.org
Subject: Re: Please help: Is ext4 counting trims as writes, or is something
 killing my SSD?

Ext4 is getting this information from the block layer.  Specifically,
it's calling

	part_stat_read(bd_part, sectors[WRITE])

to get the statistics information it uses to caluclate how many kb
have been written.

I'm not a block layer expert, but it may very well be the case that
TRIMS are being counted as requests.  Requests are categorized as
either READS or WRITES, and I don't see any special casing for non r/w
requests in block/blk-core.c.

Regards,

						- Ted
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