From: Peter Zijlstra <peterz@infradead.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: Joerg Roedel <jroedel@suse.de>, Joerg Roedel <joro@8bytes.org>,
X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Arnd Bergmann <arnd@arndb.de>,
Andrew Morton <akpm@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Vlastimil Babka <vbabka@suse.cz>,
Michal Hocko <mhocko@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux ACPI <linux-acpi@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings()
Date: Mon, 11 May 2020 09:42:43 +0200 [thread overview]
Message-ID: <20200511074243.GE2957@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CALCETrVU-+G3K5ABBRSEMiwnskL4mZsVcoTESZXnu34J7TaOqw@mail.gmail.com>
On Sat, May 09, 2020 at 12:05:29PM -0700, Andy Lutomirski wrote:
> On x86_64, the only real advantage is that the handful of corner cases
> that make vmalloc faults unpleasant (mostly relating to vmap stacks)
> go away. On x86_32, a bunch of mind-bending stuff (everything your
> series deletes but also almost everything your series *adds*) goes
> away. There may be a genuine tiny performance hit on 2-level systems
> due to the loss of huge pages in vmalloc space, but I'm not sure I
> care or that we use them anyway on these systems. And PeterZ can stop
> even thinking about RCU.
>
> Am I making sense?
I think it'll work for x86_64 and that is really all I care about :-)
next prev parent reply other threads:[~2020-05-11 7:43 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 14:40 [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings() Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 1/7] mm: Add functions to track page directory modifications Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 2/7] mm/vmalloc: Track which page-table levels were modified Joerg Roedel
2020-05-08 19:10 ` Peter Zijlstra
2020-05-08 21:23 ` Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 3/7] mm/ioremap: " Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 4/7] x86/mm/64: Implement arch_sync_kernel_mappings() Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 5/7] x86/mm/32: " Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 6/7] mm: Remove vmalloc_sync_(un)mappings() Joerg Roedel
2020-05-08 18:58 ` Steven Rostedt
2020-05-08 21:24 ` Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 7/7] x86/mm: Remove vmalloc faulting Joerg Roedel
2020-05-08 19:20 ` [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings() Peter Zijlstra
2020-05-08 21:34 ` Joerg Roedel
2020-05-09 9:25 ` Peter Zijlstra
2020-05-09 17:54 ` Joerg Roedel
2020-05-10 1:11 ` Matthew Wilcox
2020-05-11 7:31 ` Peter Zijlstra
2020-05-11 15:52 ` Matthew Wilcox
2020-05-11 16:08 ` Matthew Wilcox
2020-05-11 17:02 ` Peter Zijlstra
2020-05-08 21:33 ` Andy Lutomirski
2020-05-08 21:36 ` Joerg Roedel
2020-05-08 23:49 ` Andy Lutomirski
2020-05-09 17:52 ` Joerg Roedel
2020-05-09 19:05 ` Andy Lutomirski
2020-05-09 21:57 ` Joerg Roedel
2020-05-10 5:05 ` Andy Lutomirski
2020-05-10 8:15 ` Joerg Roedel
2020-05-11 7:42 ` Peter Zijlstra [this message]
2020-05-11 15:36 ` Andy Lutomirski
2020-05-11 17:06 ` Peter Zijlstra
2020-05-11 19:14 ` Joerg Roedel
2020-05-11 19:36 ` Andy Lutomirski
2020-05-12 15:02 ` Joerg Roedel
2020-05-12 15:13 ` Steven Rostedt
2020-05-11 20:50 ` Steven Rostedt
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