From: Oren Twaig <oren@scalemp.com>
To: Anthony Iliopoulos <anthony.iliopoulos@huawei.com>,
Dave Hansen <dave@sr71.net>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Shay Goikhman <shay.goikhman@huawei.com>,
Paul Mundt <paul.mundt@huawei.com>,
Carlos Villavieja <villavieja@hps.utexas.edu>,
Nacho Navarro <nacho.navarro@bsc.es>,
Avi Mendelson <avi.mendelson@tce.technion.ac.il>,
Yoav Etsion <yetsion@tce.technion.ac.il>,
Gerald Schaefer <gerald.schaefer@de.ibm.com>,
David Gibson <david@gibson.dropbear.id.au>,
linux-arch <linux-arch@vger.kernel.org>
Subject: Re: [PATCH] x86, hugetlb: add missing TLB page invalidation for hugetlb_cow()
Date: Thu, 15 May 2014 10:05:05 +0300 [thread overview]
Message-ID: <53746721.6060408@scalemp.com> (raw)
In-Reply-To: <20140515170035.GA15779@server-36.huawei.corp>
On 05/15/2014 08:00 PM, Anthony Iliopoulos wrote:
> I have dismissed this case, since I assume that there are many more
> cycles spent in servicing the TLB invalidation IPI, walking the pgtable
> plus other related overhead (e.g. sched) than in updating the pte/pmd
> so I am not sure how possible it would be to hit this condition.
Hi Anthony,
I have a question about the above statement. What will happen with multi
cpu VMs ? won't the race described above can happen ? I.e one virtual CPU
can will visit the host and the other will continue to encounter your race ?
Thanks,
Oren.
next prev parent reply other threads:[~2014-05-15 7:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-14 9:29 [PATCH] x86, hugetlb: add missing TLB page invalidation for hugetlb_cow() Anthony Iliopoulos
2014-05-13 22:44 ` Dave Hansen
2014-05-15 17:00 ` Anthony Iliopoulos
2014-05-15 17:00 ` Anthony Iliopoulos
2014-05-14 17:24 ` Dave Hansen
2014-05-15 7:05 ` Oren Twaig [this message]
2014-05-17 9:24 ` Anthony Iliopoulos
2014-05-17 9:24 ` Anthony Iliopoulos
2014-05-13 23:36 ` [tip:x86/urgent] x86, mm, hugetlb: Add " tip-bot for Anthony Iliopoulos
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