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From: Matthew Wilcox <willy@infradead.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Joerg Roedel <jroedel@suse.de>, Joerg Roedel <joro@8bytes.org>,
	x86@kernel.org, hpa@zytor.com,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	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>,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings()
Date: Mon, 11 May 2020 08:52:04 -0700	[thread overview]
Message-ID: <20200511155204.GW16070@bombadil.infradead.org> (raw)
In-Reply-To: <20200511073134.GD2957@hirez.programming.kicks-ass.net>

On Mon, May 11, 2020 at 09:31:34AM +0200, Peter Zijlstra wrote:
> On Sat, May 09, 2020 at 06:11:57PM -0700, Matthew Wilcox wrote:
> > Iterating an XArray (whether the entire thing
> > or with marks) is RCU-safe and faster than iterating a linked list,
> > so this should solve the problem?
> 
> It can hardly be faster if you want all elements -- which is I think the
> case here. We only call into this if we change an entry, and then we
> need to propagate that change to all.

Of course it can be faster.  Iterating an array is faster than iterating
a linked list because caches.  While an XArray is a segmented array
(so slower than a plain array), it's plainly going to be faster than
iterating a linked list.


  reply	other threads:[~2020-05-11 15:52 UTC|newest]

Thread overview: 42+ 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 [this message]
2020-05-11 16:08             ` Matthew Wilcox
2020-05-11 17:02             ` Peter Zijlstra
2020-05-08 21:33 ` Andy Lutomirski
2020-05-08 21:33   ` Andy Lutomirski
2020-05-08 21:36   ` Joerg Roedel
2020-05-08 23:49     ` Andy Lutomirski
2020-05-08 23:49       ` Andy Lutomirski
2020-05-09 17:52       ` Joerg Roedel
2020-05-09 19:05         ` Andy Lutomirski
2020-05-09 19:05           ` Andy Lutomirski
2020-05-09 21:57           ` Joerg Roedel
2020-05-10  5:05             ` Andy Lutomirski
2020-05-10  5:05               ` Andy Lutomirski
2020-05-10  8:15               ` Joerg Roedel
2020-05-11  7:42           ` Peter Zijlstra
2020-05-11 15:36             ` Andy Lutomirski
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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