From: Alexander Duyck <alexander.duyck@gmail.com>
To: Nitesh Narayan Lal <nitesh@redhat.com>
Cc: kvm list <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Paolo Bonzini <pbonzini@redhat.com>,
lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com,
Yang Zhang <yang.zhang.wz@gmail.com>,
Rik van Riel <riel@surriel.com>,
David Hildenbrand <david@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
dodgen@google.com, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
dhildenb@redhat.com, Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [QEMU PATCH] KVM: Support for page hinting
Date: Tue, 4 Jun 2019 09:41:56 -0700 [thread overview]
Message-ID: <CAKgT0UeRzF24WeVkTN2WW41iKSUpXpZbpD55-g=MBHf814RV+A@mail.gmail.com> (raw)
In-Reply-To: <20190603170432.1195-1-nitesh@redhat.com>
On Mon, Jun 3, 2019 at 10:04 AM Nitesh Narayan Lal <nitesh@redhat.com> wrote:
>
> Enables QEMU to call madvise on the pages which are reported
> by the guest kernel.
>
> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
> ---
> hw/virtio/trace-events | 1 +
> hw/virtio/virtio-balloon.c | 85 +++++++++++++++++++
> include/hw/virtio/virtio-balloon.h | 2 +-
> include/qemu/osdep.h | 7 ++
> .../standard-headers/linux/virtio_balloon.h | 1 +
> 5 files changed, 95 insertions(+), 1 deletion(-)
<snip>
> diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
> index 840af09cb0..4d632933a9 100644
> --- a/include/qemu/osdep.h
> +++ b/include/qemu/osdep.h
> @@ -360,6 +360,11 @@ void qemu_anon_ram_free(void *ptr, size_t size);
> #else
> #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
> #endif
> +#ifdef MADV_FREE
> +#define QEMU_MADV_FREE MADV_FREE
> +#else
> +#define QEMU_MADV_FREE QEMU_MADV_INVALID
> +#endif
Is there a specific reason for making this default to INVALID instead
of just using DONTNEED? I ran into some issues as my host kernel
didn't have support for MADV_FREE in the exported kernel headers
apparently so I was getting no effect. It seems like it would be
better to fall back to doing DONTNEED instead of just disabling the
functionality all together.
> #elif defined(CONFIG_POSIX_MADVISE)
>
> @@ -373,6 +378,7 @@ void qemu_anon_ram_free(void *ptr, size_t size);
> #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
> #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
> #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
> +#define QEMU_MADV_FREE QEMU_MADV_INVALID
Same here. If you already have MADV_DONTNEED you could just use that
instead of disabling the functionality.
> #else /* no-op */
>
> @@ -386,6 +392,7 @@ void qemu_anon_ram_free(void *ptr, size_t size);
> #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
> #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
> #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
> +#define QEMU_MADV_FREE QEMU_MADV_INVALID
>
> #endif
>
next prev parent reply other threads:[~2019-06-04 16:42 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-03 17:03 [RFC][Patch v10 0/2] mm: Support for page hinting Nitesh Narayan Lal
2019-06-03 17:03 ` [RFC][Patch v10 1/2] mm: page_hinting: core infrastructure Nitesh Narayan Lal
2019-06-03 19:04 ` Alexander Duyck
2019-06-04 12:55 ` Nitesh Narayan Lal
2019-06-04 15:14 ` Alexander Duyck
2019-06-04 16:07 ` Nitesh Narayan Lal
2019-06-04 16:25 ` Alexander Duyck
2019-06-04 16:42 ` Nitesh Narayan Lal
2019-06-04 17:12 ` Alexander Duyck
2019-06-03 19:57 ` David Hildenbrand
2019-06-04 13:16 ` Nitesh Narayan Lal
2019-06-14 7:24 ` David Hildenbrand
2019-06-03 17:03 ` [RFC][Patch v10 2/2] virtio-balloon: page_hinting: reporting to the host Nitesh Narayan Lal
2019-06-03 22:38 ` Alexander Duyck
2019-06-04 7:12 ` David Hildenbrand
2019-06-04 11:50 ` Nitesh Narayan Lal
2019-06-04 11:31 ` Nitesh Narayan Lal
2019-06-04 16:33 ` Alexander Duyck
2019-06-04 16:44 ` Nitesh Narayan Lal
2019-06-03 17:04 ` [QEMU PATCH] KVM: Support for page hinting Nitesh Narayan Lal
2019-06-03 18:34 ` Alexander Duyck
2019-06-03 18:37 ` Nitesh Narayan Lal
2019-06-03 18:45 ` Nitesh Narayan Lal
2019-06-04 16:41 ` Alexander Duyck [this message]
2019-06-04 16:48 ` Nitesh Narayan Lal
2019-06-03 18:04 ` [RFC][Patch v10 0/2] mm: " Michael S. Tsirkin
2019-06-03 18:38 ` Nitesh Narayan Lal
2019-06-11 12:19 ` Nitesh Narayan Lal
2019-06-11 15:00 ` Alexander Duyck
2019-06-25 14:48 ` Nitesh Narayan Lal
2019-06-25 17:10 ` Alexander Duyck
2019-06-25 17:31 ` Nitesh Narayan Lal
2019-06-28 18:25 ` Alexander Duyck
2019-06-28 19:13 ` Nitesh Narayan Lal
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