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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-mm@kvack.org
Subject: TLB flushes on s390
Date: Wed, 6 May 2015 14:29:39 +0300	[thread overview]
Message-ID: <20150506112939.GA17739@node.dhcp.inet.fi> (raw)

Hi,

I'm looking though s390 code around page table handling and I found that
in many places s390 does tlb flush before changing page table entry.

Let's look for instance on pmdp_clear_flush() implementation on s390.
It's implemented with pmdp_get_and_clear() which does pmdp_flush_direct()
*before* pmd_clear(). That's invert order comparing to generic
pmdp_flush_direct().

The question is what prevents tlb from being re-fill between flushing tlb
and clearing page table entry?

-- 
 Kirill A. Shutemov

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             reply	other threads:[~2015-05-06 11:29 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-06 11:29 Kirill A. Shutemov [this message]
2015-05-06 12:00 ` TLB flushes on s390 Martin Schwidefsky
2015-05-06 12:50   ` Kirill A. Shutemov
2015-05-06 12:56     ` Martin Schwidefsky

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