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From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
To: tglx@linutronix.de, mingo@elte.hu
Cc: linux-kernel@vger.kernel.org, arjan@linux.intel.com
Subject: issue with patch "x86: no CPA on iounmap"
Date: Mon, 4 Feb 2008 17:13:57 -0800	[thread overview]
Message-ID: <20080205011357.GA14712@linux-os.sc.intel.com> (raw)

This is wrt to x86 git commit f56d005d30342a45d8af2b75ecccc82200f09600
	"x86: no CPA on iounmap"

This can use performance issue. When a GART driver unmaps a RAM page,
which was mapped as UC, this commit will still retain UC attribute
on the kernel identity mapping. This can cause mysterious performance issue
if this freed page gets used by kernel later.

For now we should change the attribute during iounmap and in future PAT
infrastructure will have necessary hooks to avoid the aliasing issues.

thanks,
suresh

             reply	other threads:[~2008-02-05  1:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-05  1:13 Siddha, Suresh B [this message]
2008-02-05  4:41 ` Arjan van de Ven
2008-02-05  4:48 ` Arjan van de Ven
2008-02-05  7:05   ` Ingo Molnar
2008-02-05  7:14     ` Arjan van de Ven
2008-02-07 20:02     ` Siddha, Suresh B

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