From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Denys Vlasenko <dvlasenk@redhat.com>,
Brian Gerst <brgerst@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>, Waiman Long <waiman.long@hp.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 03/11] x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()
Date: Thu, 10 Mar 2016 10:56:01 +0100 [thread overview]
Message-ID: <20160310095601.GA9677@gmail.com> (raw)
In-Reply-To: <CALCETrUijqLwS98M_EnW5OH=CSv_SwjKGC5FkAxFEcWiq0RM2A@mail.gmail.com>
* Andy Lutomirski <luto@amacapital.net> wrote:
> On Fri, Feb 12, 2016 at 11:04 AM, Andy Lutomirski <luto@amacapital.net> wrote:
> > On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@kernel.org> wrote:
> >> So when memory hotplug removes a piece of physical memory from pagetable
> >> mappings, it also frees the underlying PGD entry.
> >>
> >> This complicates PGD management, so don't do this. We can keep the
> >> PGD mapped and the PUD table all clear - it's only a single 4K page
> >> per 512 GB of memory hotplugged.
> >
> > Ressurecting an ancient thread: I want this particular change to make
> > it (much) easier to make vmapped stacks work correctly. Could it be
> > applied by itself?
> >
>
> It's incomplete. pageattr.c has another instance of the same thing.
> I'll see if I can make it work, but I may end up doing something a
> little different.
If so then mind picking up (and fixing ;-) tip:WIP.x86/mm in its entirety? It's
well tested so shouldn't have too many easy to hit bugs. Feel free to rebase and
restructure it, it's a WIP tree.
I keep getting distracted with other things but I'd hate if this got dropped on
the floor.
Thanks,
Ingo
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next prev parent reply other threads:[~2016-03-10 9:56 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-22 6:23 [PATCH 00/11] x86/mm: Implement lockless pgd_alloc()/pgd_free() Ingo Molnar
2015-09-22 6:23 ` [PATCH 01/11] x86/mm/pat: Don't free PGD entries on memory unmap Ingo Molnar
2015-09-22 17:41 ` Linus Torvalds
2015-09-22 18:03 ` Andy Lutomirski
2015-09-22 6:23 ` [PATCH 02/11] x86/mm/hotplug: Remove pgd_list use from the memory hotplug code Ingo Molnar
2015-09-22 17:48 ` Linus Torvalds
2015-09-23 11:44 ` Oleg Nesterov
2015-09-29 8:42 ` Ingo Molnar
2015-09-29 16:51 ` Oleg Nesterov
2015-09-22 6:23 ` [PATCH 03/11] x86/mm/hotplug: Don't remove PGD entries in remove_pagetable() Ingo Molnar
2015-10-06 3:35 ` Kamezawa Hiroyuki
2016-02-12 19:04 ` Andy Lutomirski
2016-03-10 6:45 ` Andy Lutomirski
2016-03-10 9:56 ` Ingo Molnar [this message]
2016-03-11 1:52 ` Andy Lutomirski
2015-09-22 6:23 ` [PATCH 04/11] x86/mm/hotplug: Simplify sync_global_pgds() Ingo Molnar
2015-09-22 6:23 ` [PATCH 05/11] mm: Introduce arch_pgd_init_late() Ingo Molnar
2015-09-22 17:55 ` Linus Torvalds
2015-09-22 18:00 ` Andy Lutomirski
2015-09-22 18:26 ` Linus Torvalds
2015-09-22 18:37 ` Andy Lutomirski
2015-09-22 18:44 ` Linus Torvalds
2015-09-22 18:52 ` Andy Lutomirski
2015-09-22 6:23 ` [PATCH 06/11] x86/virt/guest/xen: Remove use of pgd_list from the Xen guest code Ingo Molnar
2015-09-22 17:58 ` Linus Torvalds
2015-09-29 8:44 ` Ingo Molnar
2015-09-22 6:23 ` [PATCH 07/11] x86/mm: Remove pgd_list use from vmalloc_sync_all() Ingo Molnar
2015-09-22 17:59 ` Linus Torvalds
2015-09-22 6:23 ` [PATCH 08/11] x86/mm/pat/32: Remove pgd_list use from the PAT code Ingo Molnar
2015-09-22 6:23 ` [PATCH 09/11] x86/mm: Make pgd_alloc()/pgd_free() lockless Ingo Molnar
2015-09-22 6:23 ` [PATCH 10/11] x86/mm: Remove pgd_list leftovers Ingo Molnar
2015-09-22 6:23 ` [PATCH 11/11] x86/mm: Simplify pgd_alloc() Ingo Molnar
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