linux-kernel - RE: [PATCH 1/3] pstore: Adjust buffer size for compression for smaller registered buffers

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Date:	Wed, 11 Sep 2013 18:34:59 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Aruna Balakrishnaiah <aruna@...ux.vnet.ibm.com>,
	"linuxppc-dev@...abs.org" <linuxppc-dev@...abs.org>,
	"seiji.aguchi@....com" <seiji.aguchi@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"keescook@...omium.org" <keescook@...omium.org>
CC:	"jkenisto@...ux.vnet.ibm.com" <jkenisto@...ux.vnet.ibm.com>,
	"mahesh@...ux.vnet.ibm.com" <mahesh@...ux.vnet.ibm.com>,
	"cbouatmailru@...il.com" <cbouatmailru@...il.com>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	"ccross@...roid.com" <ccross@...roid.com>
Subject: RE: [PATCH 1/3] pstore: Adjust buffer size for compression for
 smaller registered buffers

-	big_oops_buf_sz = (psinfo->bufsize * 100) / 45;
+	big_oops_buf_sz = (psinfo->bufsize * 100) / cmpr;

Tested on an ERST backed system.  Seems to be working (we save a little less information
per ERST record than before this change (uncompressed size goes down from ~17500 to
~16400 bytes) - but this patch switched the denominator from 45 to 48 (for ERST) - so that
seems plausible.

Seiji: let me know how the efivars tests go.

-Tony