linux-kernel - RE: [RESEND PATCH v2 1/4] mm/hwpoison: fix traverse hugetlbfs page to avoid printk flood

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Date:	Tue, 17 Sep 2013 16:47:39 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
CC:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Wu, Fengguang" <fengguang.wu@...el.com>,
	"gong.chen@...ux.intel.com" <gong.chen@...ux.intel.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RESEND PATCH v2 1/4] mm/hwpoison: fix traverse hugetlbfs page
 to avoid printk flood

> Transparent huge pages are not helpful for DB workload which there is a lot of 
> shared memory

Hmm. Perhaps they should be.  If a database allocates most[1] of the memory on a
machine to a shared memory segment - that *ought* to be a candidate for using
transparent huge pages.  Now that we have them they seem a better choice (much
more flexibility) than hugetlbfs.

-Tony

[1] I've been told that it is normal to configure over 95% of physical memory to the
shared memory region to run a particular transaction based benchmark with one
commercial data base application.

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