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Re: [Xen-devel] [PATCH] mm: convert totalram_pages, totalhigh_pages and managed_pages to atomic.
- To: Arun KS <arunks@xxxxxxxxxxxxxx>, Guo Ren <ren_guo@xxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, Jeff Dike <jdike@xxxxxxxxxxx>, Richard Weinberger <richard@xxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, x86@xxxxxxxxxx, David Airlie <airlied@xxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Oded Gabbay <oded.gabbay@xxxxxxxxx>, Alex Deucher <alexander.deucher@xxxxxxx>, Christian König <christian.koenig@xxxxxxx>, "David (ChunMing) Zhou" <David1.Zhou@xxxxxxx>, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>, Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>, "K. Y. 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- From: Joe Perches <joe@xxxxxxxxxxx>
- Date: Mon, 22 Oct 2018 21:15:37 -0700
- Cc: getarunks@xxxxxxxxx
- Delivery-date: Tue, 23 Oct 2018 04:53:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Mon, 2018-10-22 at 22:53 +0530, Arun KS wrote:
> Remove managed_page_count_lock spinlock and instead use atomic
> variables.
Perhaps better to define and use macros for the accesses
instead of specific uses of atomic_long_<inc/dec/read>
Something like:
#define totalram_pages() (unsigned
long)atomic_long_read(&_totalram_pages)
#define totalram_pages_inc() (unsigned long)atomic_long_inc(&_totalram_pages)
#define totalram_pages_dec() (unsigned long)atomic_long_dec(&_totalram_pages)
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