From: Matthew Wilcox <willy@infradead.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
Vlastimil Babka <vbabka@suse.cz>,
Randy Dunlap <rdunlap@infradead.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH V2] mm/thp: Make ALLOC_SPLIT_PTLOCKS dependent on USE_SPLIT_PTE_PTLOCKS
Date: Thu, 1 Jul 2021 13:57:29 +0100 [thread overview]
Message-ID: <YN27uc64s/yllfQR@casper.infradead.org> (raw)
In-Reply-To: <9d1ce685-e0fd-febd-5ff2-179f7fa6e3fa@arm.com>
On Thu, Jul 01, 2021 at 10:51:27AM +0530, Anshuman Khandual wrote:
>
>
> On 5/20/21 4:47 PM, Matthew Wilcox wrote:
> > On Wed, May 19, 2021 at 01:03:06PM +0530, Anshuman Khandual wrote:
> >> Split ptlocks need not be defined and allocated unless they are being used.
> >> ALLOC_SPLIT_PTLOCKS is inherently dependent on USE_SPLIT_PTE_PTLOCKS. This
> >> just makes it explicit and clear. While here drop the spinlock_t element
> >> from the struct page when USE_SPLIT_PTE_PTLOCKS is not enabled.
> >
> > I didn't spot this email yesterday. I'm not a fan. Isn't struct page
> > already complicated enough without adding another ifdef to it? Surely
> > there's a better way than this.
>
> This discussion thread just got dropped off the radar, sorry about it.
> None of the spinlock_t elements are required unless split ptlocks are
> in use. I understand your concern regarding yet another #ifdef in the
> struct page definition. But this change is simple and minimal. Do you
> have any other particular alternative in mind which I could explore ?
Do nothing? I don't understand what problem you're trying to solve.
next prev parent reply other threads:[~2021-07-01 12:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 7:33 [PATCH V2] mm/thp: Make ALLOC_SPLIT_PTLOCKS dependent on USE_SPLIT_PTE_PTLOCKS Anshuman Khandual
2021-05-20 11:17 ` Matthew Wilcox
2021-07-01 5:21 ` Anshuman Khandual
2021-07-01 12:57 ` Matthew Wilcox [this message]
2021-07-05 3:27 ` Anshuman Khandual
2021-07-05 3:28 ` Matthew Wilcox
2021-07-05 3:39 ` Anshuman Khandual
2021-07-05 11:30 ` Matthew Wilcox
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