From: Julien Grall <julien.grall@citrix.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: <xen-devel@lists.xenproject.org>,
<linux-arm-kernel@lists.infradead.org>, <ian.campbell@citrix.com>,
<linux-kernel@vger.kernel.org>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
David Vrabel <david.vrabel@citrix.com>,
Wei Liu <wei.liu2@citrix.com>
Subject: Re: [PATCH v2 12/20] xen/balloon: Don't rely on the page granularity is the same for Xen and Linux
Date: Fri, 17 Jul 2015 15:32:46 +0100 [thread overview]
Message-ID: <55A9120E.4020302@citrix.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1507161819200.17378@kaball.uk.xensource.com>
Hi Stefano,
On 17/07/15 15:03, Stefano Stabellini wrote:
>> ---
>> drivers/xen/balloon.c | 147 +++++++++++++++++++++++++++++++++++---------------
>> 1 file changed, 105 insertions(+), 42 deletions(-)
>>
>> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
>> index fd93369..19a72b1 100644
>> --- a/drivers/xen/balloon.c
>> +++ b/drivers/xen/balloon.c
>> @@ -230,6 +230,7 @@ static enum bp_state reserve_additional_memory(long credit)
>> nid = memory_add_physaddr_to_nid(hotplug_start_paddr);
>>
>> #ifdef CONFIG_XEN_HAVE_PVMMU
>> + /* TODO */
>
> I think you need to be more verbose than that: TODO what?
It was for me to remember fixing reserve_additional_memory. I did it and
forgot to remove the TODO when I clean up.
I will drop it in the next version.
[...]
>> static enum bp_state increase_reservation(unsigned long nr_pages)
>> {
>> int rc;
>> - unsigned long pfn, i;
>> + unsigned long i, frame_idx;
>> struct page *page;
>> struct xen_memory_reservation reservation = {
>> .address_bits = 0,
>> @@ -343,44 +406,43 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
>> }
>> #endif
>>
>> - if (nr_pages > ARRAY_SIZE(frame_list))
>> - nr_pages = ARRAY_SIZE(frame_list);
>> + if (nr_pages > (ARRAY_SIZE(frame_list) / XEN_PFN_PER_PAGE))
>> + nr_pages = ARRAY_SIZE(frame_list) / XEN_PFN_PER_PAGE;
>>
>> + frame_idx = 0;
>> page = list_first_entry_or_null(&ballooned_pages, struct page, lru);
>> for (i = 0; i < nr_pages; i++) {
>> if (!page) {
>> nr_pages = i;
>> break;
>> }
>> - frame_list[i] = page_to_pfn(page);
>> +
>> + rc = xen_apply_to_page(page, set_frame, &frame_idx);
>> +
>> page = balloon_next_page(page);
>> }
>>
>> set_xen_guest_handle(reservation.extent_start, frame_list);
>> - reservation.nr_extents = nr_pages;
>> + reservation.nr_extents = nr_pages * XEN_PFN_PER_PAGE;
>> rc = HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
>> if (rc <= 0)
>> return BP_EAGAIN;
>>
>> - for (i = 0; i < rc; i++) {
>> + /* rc is equal to the number of Xen page populated */
>> + nr_pages = rc / XEN_PFN_PER_PAGE;
>
> Here we are purposedly ignoring any spares (rc % XEN_PFN_PER_PAGE).
> Instead of leaking them, maybe we should givem them back to Xen since we
> cannot use them?
I will give a look to do it.
>> + for (i = 0; i < nr_pages; i++) {
>> page = balloon_retrieve(false);
>> BUG_ON(page == NULL);
>>
>> - pfn = page_to_pfn(page);
>> -
>> #ifdef CONFIG_XEN_HAVE_PVMMU
>> + frame_idx = 0;
>
> Shouldn't this be before the beginning of the loop above?
Hmmmm... Yes. Note that I only compiled tested on x86, it would be good
if someone test on real hardware at some point (I don't have any x86 Xen
setup).
Regards,
--
Julien Grall
next prev parent reply other threads:[~2015-07-17 14:33 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-09 20:42 [PATCH v2 00/20] xen/arm64: Add support for 64KB page Julien Grall
2015-07-09 20:42 ` [PATCH v2 01/20] xen: Add Xen specific page definition Julien Grall
2015-07-16 14:19 ` Stefano Stabellini
2015-07-16 14:52 ` Julien Grall
2015-07-24 9:28 ` [Xen-devel] " David Vrabel
2015-07-24 9:39 ` Julien Grall
2015-07-24 9:48 ` David Vrabel
2015-07-24 9:51 ` Julien Grall
2015-07-24 10:34 ` David Vrabel
2015-07-24 10:43 ` Ian Campbell
2015-07-24 13:03 ` Julien Grall
2015-07-09 20:42 ` [PATCH v2 02/20] xen: Introduce a function to split a Linux page into Xen page Julien Grall
2015-07-16 14:23 ` Stefano Stabellini
2015-07-16 14:54 ` [Xen-devel] " Julien Grall
2015-07-24 9:31 ` David Vrabel
2015-07-24 9:54 ` Julien Grall
2015-07-24 10:10 ` David Vrabel
2015-07-24 10:20 ` Julien Grall
2015-08-05 14:30 ` Julien Grall
2015-08-05 15:50 ` David Vrabel
2015-08-05 16:06 ` Julien Grall
2015-07-09 20:42 ` [PATCH v2 03/20] xen/grant: Introduce helpers to split a page into grant Julien Grall
2015-07-16 15:01 ` Stefano Stabellini
2015-07-16 16:07 ` Julien Grall
2015-07-17 13:10 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 04/20] xen/grant: Add helper gnttab_page_grant_foreign_access_ref Julien Grall
2015-07-16 15:05 ` Stefano Stabellini
2015-07-16 16:12 ` [Xen-devel] " Julien Grall
2015-07-24 9:35 ` David Vrabel
2015-07-09 20:42 ` [PATCH v2 05/20] block/xen-blkfront: Split blkif_queue_request in 2 Julien Grall
2015-07-21 9:54 ` Roger Pau Monné
2015-07-21 11:12 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 06/20] block/xen-blkfront: Store a page rather a pfn in the grant structure Julien Grall
2015-07-16 15:11 ` Stefano Stabellini
2015-07-23 17:18 ` Julien Grall
2015-07-21 10:16 ` Roger Pau Monné
2015-07-21 11:19 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 07/20] block/xen-blkfront: split get_grant in 2 Julien Grall
2015-07-21 10:30 ` Roger Pau Monné
2015-07-21 13:03 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 08/20] net/xen-netback: xenvif_gop_frag_copy: move GSO check out of the loop Julien Grall
2015-07-09 20:42 ` [PATCH v2 09/20] xen/biomerge: Don't allow biovec to be merge when Linux is not using 4KB page Julien Grall
2015-07-10 19:12 ` Konrad Rzeszutek Wilk
2015-07-15 8:56 ` [Xen-devel] " Julien Grall
2015-07-16 15:33 ` Stefano Stabellini
2015-07-16 16:15 ` [Xen-devel] " Julien Grall
2015-07-16 18:30 ` Konrad Rzeszutek Wilk
2015-07-17 13:20 ` Stefano Stabellini
2015-07-17 14:44 ` Julien Grall
2015-07-17 14:45 ` Stefano Stabellini
2015-07-17 14:46 ` Julien Grall
2015-07-09 20:42 ` [PATCH v2 10/20] xen/xenbus: Use Xen page definition Julien Grall
2015-07-16 15:35 ` Stefano Stabellini
2015-07-24 9:49 ` David Vrabel
2015-07-09 20:42 ` [PATCH v2 11/20] tty/hvc: xen: Use xen " Julien Grall
2015-07-16 15:36 ` Stefano Stabellini
2015-07-24 9:52 ` David Vrabel
2015-07-09 20:42 ` [PATCH v2 12/20] xen/balloon: Don't rely on the page granularity is the same for Xen and Linux Julien Grall
2015-07-17 14:03 ` Stefano Stabellini
2015-07-17 14:32 ` Julien Grall [this message]
2015-07-09 20:42 ` [PATCH v2 13/20] xen/events: fifo: Make it running on 64KB granularity Julien Grall
2015-07-16 15:43 ` Stefano Stabellini
2015-07-16 16:18 ` [Xen-devel] " Julien Grall
2015-07-17 13:06 ` Stefano Stabellini
2015-07-24 10:36 ` David Vrabel
2015-08-06 15:43 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 14/20] xen/grant-table: " Julien Grall
2015-07-16 15:47 ` Stefano Stabellini
2015-07-16 16:23 ` [Xen-devel] " Julien Grall
2015-07-17 13:37 ` Stefano Stabellini
2015-07-09 20:42 ` [PATCH v2 15/20] block/xen-blkfront: Make it running on 64KB page granularity Julien Grall
2015-07-21 11:06 ` Roger Pau Monné
2015-07-21 13:07 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 16/20] block/xen-blkback: " Julien Grall
2015-07-09 20:42 ` [PATCH v2 17/20] net/xen-netfront: " Julien Grall
2015-07-20 17:26 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 18/20] net/xen-netback: " Julien Grall
2015-07-09 20:42 ` [PATCH v2 19/20] xen/privcmd: Add support for Linux " Julien Grall
2015-07-13 20:13 ` Boris Ostrovsky
2015-07-13 22:05 ` Julien Grall
2015-07-14 15:28 ` Boris Ostrovsky
2015-07-14 15:37 ` Julien Grall
2015-07-16 17:12 ` Stefano Stabellini
2015-07-16 17:16 ` Stefano Stabellini
2015-07-17 12:50 ` [Xen-devel] " Julien Grall
2015-07-09 20:42 ` [PATCH v2 20/20] arm/xen: Add support for " Julien Grall
2015-07-20 17:54 ` [Xen-devel] [PATCH v2 00/20] xen/arm64: Add support for 64KB page Julien Grall
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