From: Shakeel Butt <shakeelb@google.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: mark.rutland@arm.com, Michal Hocko <mhocko@suse.com>,
linux-sh@vger.kernel.org, peterz@infradead.org,
catalin.marinas@arm.com,
Dave Hansen <dave.hansen@linux.intel.com>,
will.deacon@arm.com, christoffer.dall@arm.com,
Linux MM <linux-mm@kvack.org>,
kvmarm@lists.cs.columbia.edu, aneesh.kumar@linux.ibm.com,
linux@armlinux.org.uk, Ingo Molnar <mingo@redhat.com>,
Vlastimil Babka <vbabka@suse.cz>,
David Rientjes <rientjes@google.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
marc.zyngier@arm.com, Mike Rapoport <rppt@linux.vnet.ibm.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org, ard.biesheuvel@linaro.org,
linuxppc-dev@lists.ozlabs.org, steve.capper@arm.com,
LKML <linux-kernel@vger.kernel.org>,
james.morse@arm.com, Andrew Morton <akpm@linux-foundation.org>,
robin.murphy@arm.com
Subject: Re: [PATCH] mm: Introduce GFP_PGTABLE
Date: Sat, 12 Jan 2019 08:50:42 -0800 [thread overview]
Message-ID: <CALvZod5XfFujzzMC0n2dZmofjof0juWw45RF4475CAEu9nAv3Q@mail.gmail.com> (raw)
In-Reply-To: <20190112154944.GT6310@bombadil.infradead.org>
On Sat, Jan 12, 2019 at 7:50 AM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Sat, Jan 12, 2019 at 02:49:29PM +0100, Christophe Leroy wrote:
> > As far as I can see,
> >
> > #define GFP_KERNEL_ACCOUNT (GFP_KERNEL | __GFP_ACCOUNT)
> >
> > So what's the difference between:
> >
> > (GFP_KERNEL_ACCOUNT | __GFP_ZERO) & ~__GFP_ACCOUNT
> >
> > and
> >
> > (GFP_KERNEL | __GFP_ZERO) & ~__GFP_ACCOUNT
>
> Nothing. But there's a huge difference in the other parts of that same
> file where GFP_ACCOUNT is _not_ used.
>
> I think this unification is too small to bother with. Something I've
> had on my todo list for some time and have not done anything about
> is to actually unify all of the architecture pte/pmd/... allocations.
> There are tricks some architectures use that others would benefit from.
Can you explain a bit more on this? If this is too low priority on
your todo list then maybe me or someone else can pick that up.
Shakeel
next prev parent reply other threads:[~2019-01-12 22:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-12 10:26 [PATCH] mm: Introduce GFP_PGTABLE Anshuman Khandual
2019-01-12 12:12 ` Matthew Wilcox
2019-01-12 12:55 ` Anshuman Khandual
2019-01-12 13:49 ` Christophe Leroy
2019-01-12 15:49 ` Matthew Wilcox
2019-01-12 16:50 ` Shakeel Butt [this message]
2019-01-14 4:28 ` Anshuman Khandual
2019-01-12 16:48 ` Shakeel Butt
2019-01-14 4:14 ` Anshuman Khandual
2019-01-13 17:35 ` Michal Hocko
2019-01-14 4:00 ` Anshuman Khandual
2019-01-14 7:01 ` Michal Hocko
2019-01-15 14:11 ` Anshuman Khandual
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