From: Joerg Roedel <jroedel@suse.de>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
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: Tue, 12 May 2020 17:02:50 +0200 [thread overview]
Message-ID: <20200512150250.GC8135@suse.de> (raw)
In-Reply-To: <8D6745B7-0EC2-4FCC-B6FC-E7E1557EB18E@amacapital.net>
On Mon, May 11, 2020 at 12:36:19PM -0700, Andy Lutomirski wrote:
> I’m guessing the right solution is either your series or your series
> plus preallocation on 64-bit. I’m just grumpy about it...
Okay, so we can do the pre-allocation when it turns out the pgd_list
lock-times become a problem on x86-64. The tracking code in vmalloc.c is
needed anyway for 32-bit and there is no reason why 64-bit shouldn't use
it as well for now.
I don't think that taking the lock _will_ be a problem, as it is only
taken when a new PGD/P4D entry is populated. And it is pretty unlikely
that a system will populate all 64 of them, with 4-level paging each of
these entries will map 512GB of address space. But if I am wrong here
pre-allocating is still an option.
Joerg
next prev parent reply other threads:[~2020-05-12 15:02 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
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 [this message]
2020-05-12 15:13 ` Steven Rostedt
2020-05-11 20:50 ` Steven Rostedt
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