On 2012-09-06 06:41, Arnaldo Carvalho de Melo wrote:
> Em Wed, Sep 05, 2012 at 10:23:03PM +0100, Richard Purdie escreveu:
> > On Wed, 2012-09-05 at 13:54 -0700, Arnaldo Carvalho de Melo wrote:
> > > Em Fri, Aug 24, 2012 at 11:10:39AM +0800, Liang Li escreveu:
> > > &
Implement console poll for pch_uart, this could enable KGDBoC when
on pch-uart console.
Signed-off-by: Liang Li
Acked-by: Jason Wessel
---
drivers/tty/serial/pch_uart.c | 103 --
1 file changed, 79 insertions(+), 24 deletions(-)
diff --git a/drivers/tty
ty of the
default hard coded path. We can also make the slang include directory
a variable, to allow the user to specify SLANG_INC and set their own
include location. And add a '=' prefix to indicate better
compatibility with sysroot/cross compile cases.
Signed-off-by: Liang Li
---
t
if (uart_handle_break(port))
continue;
}
+#ifdef SUPPORT_SYSRQ
if (port->sysrq) {
if (uart_handle_sysrq_char(port, rbr))
continue;
}
+#endif
On 2013-01-24 12:15, Stephen Rothwell wrote:
> Hi,
>
> On Thu, 24 Jan 2013 10:30:54 +0800 Liang Li wrote:
> >
> > Should I add a fix for the compile error .. or do squash then send out
> > refreshed patch ?
>
> You need to send a fix patch to Greg based on his
tty/serial/pch_uart.c: In function 'pch_uart_hal_read':
drivers/tty/serial/pch_uart.c:572:11: error: 'struct uart_port' has no member
named 'sysrq'
make[4]: *** [drivers/tty/serial/pch_uart.o] Error 1
Reported-by: Randy Dunlap
CC: Stephen Rothwell
Signed-off-by: Lia
s disabled.
So in the call sequence lead by pch_uart_interrupt, we should be
carefully to call functions that will 'print message to console' only
in case the uart port is not being used as serial console.
Signed-off-by: Liang Li
---
drivers/tty/serial/pch_uart.c | 29 ++---
he lock in pch_console_write.
Signed-off-by: Liang Li
---
drivers/tty/serial/pch_uart.c | 27 +++
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 2e99f79..f2d67df 100644
--- a/drivers/tty/serial/
++
1 file changed, 41 insertions(+), 15 deletions(-)
---
Thanks,
Liang Li
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Please read
about the page bitmap. e.g. the page size, page bitmap length and
start pfn.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
---
include/uapi/linux/virtio_balloon.h | 19 +++
1 file changed, 19 insertions(+)
diff
page information with the bitmap
* Address the issues referred in MST's comments
Liang Li (7):
virtio-balloon: rework deflate to add page to a list
virtio-balloon: define new feature bit and page bitmap head
mm: add a function to get the max pfn
virtio-balloon: speed up inflate/d
Will allow faster notifications using a bitmap down the road.
balloon_pfn_to_page() can be removed because it's useless.
Signed-off-by: Liang Li
Signed-off-by: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
---
drivers/virtio/virtio_balloon.c
corrected by the dirty
page logging mechanism.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
---
include/linux/mm.h | 2 ++
mm/page_alloc.c| 84
Support the request for vm's unused page information, response with
a page bitmap. QEMU can make use of this bitmap and the dirty page
logging mechanism to skip the transportation of these unused pages,
this is very helpful to speed up the live migration process.
Signed-off-by: Liang L
Expose the function to get the max pfn, so it can be used in the
virtio-balloon device driver. Simply include the 'linux/bootmem.h'
is not enough, if the device driver is built to a module, directly
refer the max_pfn lead to build failed.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc:
VMM hypervisor can get some
of guest's runtime information through this virtual queue, e.g. the
guest's unused page information, which can be used for live migration
optimization.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: D
ture, inflating the
balloon to 7GB of a 8GB idle guest only takes 590ms, the
performance improvement is about 85%.
TODO: optimize stage a by allocating/freeing a chunk of pages
instead of a single page at a time.
Signed-off-by: Liang Li
Suggested-by: Michael S. Tsirkin
Cc: Michael S. Tsirkin
Cc: P
Romove lazy FPU logic and use eager FPU entirely. Eager FPU does
not have performance regression, and it can simplify the code.
When compiling kernel on westmere, the performance of eager FPU
is about 0.4% faster than lazy FPU.
Signed-off-by: Liang Li
Signed-off-by: Xudong Hao
---
arch/x86
> >> On Tue 05-01-21 22:49:21, Liang Li wrote:
> >>> hugetlb manages its page in hstate's free page list, not in buddy
> >>> system, this patch try to make it works for hugetlbfs. It canbe
> >>> used for memory overcommit in virtualization and hug
On Fri, Jan 8, 2021 at 6:04 AM Mike Kravetz wrote:
>
> On 1/5/21 7:49 PM, Liang Li wrote:
> > hugetlb manages its page in hstate's free page list, not in buddy
> > system, this patch try to make it works for hugetlbfs. It canbe
> > used for memory overcommit in virtua
> > > Please don't use this email address for me anymore. Either use
> > > alexander.du...@gmail.com or alexanderdu...@fb.com. I am getting
> > > bounces when I reply to this thread because of the old address.
> >
> > No problem.
> >
> > > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > > > index eb
dicly
and cup was yielded voluntarily if needed.
Cc: Alexander Duyck
Cc: Mel Gorman
Cc: Andrea Arcangeli
Cc: Dan Williams
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Signed-off-by: Liang Li
---
reshold to control the
waking up of reporting worker.
Cc: Alexander Duyck
Cc: Mel Gorman
Cc: Andrea Arcangeli
Cc: Dan Williams
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Signed-off-by: Liang Li
---
mm/page_reporting.c |
: Dave Hansen
Cc: David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Signed-off-by: Liang Li
---
include/linux/highmem.h| 31 +++-
include/linux/page-flags.h | 16 +-
include/trace/events/mmflags.h | 7 +
mm/Kconfig
Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Signed-off-by: Liang Li
---
drivers/virtio/virtio_balloon.c | 3 +++
include/linux/page_reporting.h | 3 +++
mm/page_reporting.c | 18 ++
mm/page_reporting.h
configuring a large batch size to reduce cache
pollution.
To make the whole function works, support of pre zero out free huge pages
should be added for hugetlbfs, I will send another patch for it.
Liang Li (4):
mm: let user decide page reporting option
mm: pre zero out free pages to speed up p
the virtio_balloon driver, changes for the virtio spec are needed.
Before that, I need the feedback of the comunity about this new feature.
Liang Li (3):
mm: support hugetlb free page reporting
virtio-balloon: add support for providing free huge page reports to
host
mm: support f
David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Cc: Jason Wang
Cc: Mike Kravetz
Cc: Liang Li
Signed-off-by: Liang Li
---
include/linux/hugetlb.h| 3 +
include/linux/page_reporting.h | 5 +
mm/hugetlb.c | 29 +++
n
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Cc: Jason Wang
Cc: Mike Kravetz
Cc: Liang Li
Signed-off-by: Liang Li
---
drivers/virtio/virtio_balloon.c | 61 +
include/uapi/linux/virtio_balloon.h | 1 +
2 files changed, 62 insertions(+)
diff --git a/drivers/v
Williamson
Cc: Michael S. Tsirkin
Cc: Jason Wang
Cc: Mike Kravetz
Cc: Liang Li
Signed-off-by: Liang Li
---
mm/page_prezero.c | 17 +
1 file changed, 17 insertions(+)
diff --git a/mm/page_prezero.c b/mm/page_prezero.c
index c8ce720bfc54..dff4e0adf402 100644
--- a/mm
lloon driver, changes for the virtio spec are needed.
Before that, I need the feedback of the comunity about this new feature.
This RFC is baed on my previous series:
'[RFC v2 PATCH 0/4] speed up page allocation for __GFP_ZERO'
Liang Li (3):
mm: support hugetlb free page reportin
lloon driver, changes for the virtio spec are needed.
Before that, I need the feedback of the comunity about this new feature.
This RFC is baed on my previous series:
'[RFC v2 PATCH 0/4] speed up page allocation for __GFP_ZERO'
Liang Li (3):
mm: support hugetlb free page reportin
On Tue, Dec 22, 2020 at 4:47 PM David Hildenbrand wrote:
>
> On 21.12.20 17:25, Liang Li wrote:
> > The first version can be found at: https://lkml.org/lkml/2020/4/12/42
> >
> > Zero out the page content usually happens when allocating pages with
> > the flag
On Tue, Dec 22, 2020 at 4:28 PM David Hildenbrand wrote:
>
> On 22.12.20 08:48, Liang Li wrote:
> > Free page reporting only supports buddy pages, it can't report the
> > free pages reserved for hugetlbfs case. On the other hand, hugetlbfs
>
> The virtio-balloon
> > Free page reporting in virtio-balloon doesn't give you any guarantees
> > regarding zeroing of pages. Take a look at the QEMU implementation -
> > e.g., with vfio all reports are simply ignored.
> >
> > Also, I am not sure if mangling such details ("zeroing of pages") into
> > the page reportin
https://static.sched.com/hosted_files/kvmforum2020/51/The%20Practice%20Method%20to%20Speed%20Up%2010x%20Boot-up%20Time%20for%20Guest%20in%20Alibaba%20Cloud.pdf
> >
> > and the flowing link is mine:
> > https://static.sched.com/hosted_files/kvmforum2020/90/Speed%20Up%20Creation%20of%20a%20VM%20With%
> > =
> > QEMU use 4K pages, THP is off
> > round1 round2 round3
> > w/o this patch:23.5s 24.7s 24.6s
> > w/ this patch: 10.2s 10.3s 11.2s
> >
> > QEMU use 4K pages, THP is on
> >
> > +hugepage_reporting_cycle(struct page_reporting_dev_info *prdev,
> > +struct hstate *h, unsigned int nid,
> > +struct scatterlist *sgl, unsigned int *offset)
> > +{
> > + struct list_head *list = &h->hugepage_freelists[nid];
> > + unsi
> On 12/22/20 11:59 AM, Alexander Duyck wrote:
> > On Mon, Dec 21, 2020 at 11:47 PM Liang Li
> > wrote:
> >> +
> >> + if (huge_page_order(h) > MAX_ORDER)
> >> + budget = HUGEPAGE_REPORTING_CAPACITY;
> >> + else
>
> On 12/21/20 11:46 PM, Liang Li wrote:
> > Free page reporting only supports buddy pages, it can't report the
> > free pages reserved for hugetlbfs case. On the other hand, hugetlbfs
> > is a good choice for a system with a huge amount of RAM, because it
> &g
On Wed, Dec 23, 2020 at 4:41 PM David Hildenbrand wrote:
>
> [...]
>
> >> I was rather saying that for security it's of little use IMHO.
> >> Application/VM start up time might be improved by using huge pages (and
> >> pre-zeroing these). Free page reporting might be improved by using
> >> MADV_FR
> > > > + spin_lock_irq(&hugetlb_lock);
> > > > +
> > > > + if (huge_page_order(h) > MAX_ORDER)
> > > > + budget = HUGEPAGE_REPORTING_CAPACITY;
> > > > + else
> > > > + budget = HUGEPAGE_REPORTING_CAPACITY * 32;
> > >
> > > Wouldn't huge_page_order alwa
> >>> +static int
> >>> +hugepage_reporting_cycle(struct page_reporting_dev_info *prdev,
> >>> + struct hstate *h, unsigned int nid,
> >>> + struct scatterlist *sgl, unsigned int *offset)
> >>> +{
> >>> + struct list_head *list = &h->hugepage_freelists[
> > Win or not depends on its effect. For our case, it solves the issue
> > that we faced, so it can be thought as a win for us. If others don't
> > have the issue we faced, the result will be different, maybe they will
> > be affected by the side effect of this feature. I think this is your
> > c
On Mon, Jan 4, 2021 at 8:56 PM Michal Hocko wrote:
>
> On Mon 21-12-20 11:25:22, Liang Li wrote:
> [...]
> > Security
> >
> > This is a weak version of "introduce init_on_alloc=1 and init_on_free=1
> > boot options", which zero out page in a asy
> >>> In our production environment, there are three main applications have such
> >>> requirement, one is QEMU [creating a VM with SR-IOV passthrough device],
> >>> anther other two are DPDK related applications, DPDK OVS and SPDK vhost,
> >>> for best performance, they populate memory when starti
On Tue, Jan 5, 2021 at 5:30 PM David Hildenbrand wrote:
>
> On 05.01.21 10:20, Michal Hocko wrote:
> > On Mon 04-01-21 15:00:31, Dave Hansen wrote:
> >> On 1/4/21 12:11 PM, David Hildenbrand wrote:
> Yeah, it certainly can't be the default, but it *is* useful for
> thing where we know th
> >> That‘s mostly already existing scheduling logic, no? (How many vms can I
> >> put onto a specific machine eventually)
> >
> > It depends on how the scheduling component is designed. Yes, you can put
> > 10 VMs with 4C8G(4CPU, 8G RAM) on a host and 20 VMs with 2C4G on
> > another one. But if o
about side effect of the 'buddy
free page pre zero out' feature brings, I remove it from this
serier.
Liang Li (6):
mm: Add batch size for free page reporting
mm: let user decide page reporting option
hugetlb: add free page reporting support
hugetlb: avoid allocation failed w
other threshold to control the
waking up of reporting worker.
Cc: Alexander Duyck
Cc: Mel Gorman
Cc: Andrea Arcangeli
Cc: Dan Williams
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Cc: Liang Li
Signed-off-by: Lia
Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Cc: Liang Li
Signed-off-by: Liang Li
---
drivers/virtio/virtio_balloon.c | 3 +++
include/linux/page_reporting.h | 3 +++
mm/page_reporting.c | 13 +
mm/page_reporting.h
n
Cc: David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Cc: Liang Li
Signed-off-by: Liang Li
---
include/linux/hugetlb.h| 3 +
include/linux/page_reporting.h | 4 +
mm/Kconfig | 1 +
mm/huge
done.
Cc: Alexander Duyck
Cc: Mel Gorman
Cc: Andrea Arcangeli
Cc: Dan Williams
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Cc: Liang Li
Signed-off-by: Liang Li
---
include/linux/hugetlb.h | 2 ++
mm/hugetlb.c
patch add support for reporting free hugepage to
host when guest use hugetlbfs.
Cc: Alexander Duyck
Cc: Mel Gorman
Cc: Andrea Arcangeli
Cc: Dan Williams
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Michal Hocko
Cc: Andrew Morton
Cc: Alex Williamson
Cc: Michael S. Tsirkin
Cc: Liang Li
Signe
Williamson
Cc: Michael S. Tsirkin
Cc: Jason Wang
Cc: Liang Li
Signed-off-by: Liang Li
---
include/linux/page-flags.h | 12 ++
mm/Kconfig | 10 ++
mm/huge_memory.c | 3 +-
mm/hugetlb.c | 243 +
mm/memory.c
On Wed, Jan 6, 2021 at 5:41 PM David Hildenbrand wrote:
>
> On 06.01.21 04:46, Liang Li wrote:
> > A typical usage of hugetlbfs it's to reserve amount of memory
> > during the kernel booting stage, and the reserved pages are
> > unlikely to return to the buddy
> So you are going to need a lot more explanation for this. Page
> reporting already had the concept of batching as you could only scan
> once every 2 seconds as I recall. Thus the "PAGE_REPORTING_DELAY". The
> change you are making doesn't make any sense without additional
> context.
The reason f
> > enum {
> > PAGE_REPORTING_IDLE = 0,
> > @@ -44,7 +45,7 @@ __page_reporting_request(struct page_reporting_dev_info
> > *prdev)
> > * now we are limiting this to running no more than once every
> > * couple of seconds.
> > */
> > - schedule_delayed_work(
On Thu, Jan 7, 2021 at 12:08 AM Michal Hocko wrote:
>
> On Tue 05-01-21 22:49:21, Liang Li wrote:
> > hugetlb manages its page in hstate's free page list, not in buddy
> > system, this patch try to make it works for hugetlbfs. It canbe
> > used for memory overcommit
> > Page reporting isolates free pages temporarily when reporting
> > free pages information. It will reduce the actual free pages
> > and may cause application failed for no enough available memory.
> > This patch try to solve this issue, when there is no free page
> > and page repoting is on goin
re to the
virtio-balloon device. And now, inflating the balloon to 3GB of a 4GB
idle guest only takes 175ms, it's about 9 times as fast as before.
TODO: optimize stage a by allocating/freeing a chunk of pages instead
of a single page at a time.
Signed-off-by: Liang Li
---
drivers/virtio/vi
of a large one.
2. Address some of comments of v1.
Signed-off-by: Liang Li
Suggested-by: Michael S. Tsirkin
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
drivers/virtio/virtio_balloon.c | 207 ++--
include/uapi/linux/vi
The MPX feature requires eager KVM FPU restore support. We have verified
that MPX cannot work correctly with the current lazy KVM FPU restore
mechanism. Eager KVM FPU restore should be enabled if the MPX feature is
exposed to VM.
Signed-off-by: Liang Li
---
arch/x86/kvm/vmx.c | 2 ++
arch/x86
The MPX feature requires eager KVM FPU restore support. We have verified
that MPX cannot work correctly with the current lazy KVM FPU restore
mechanism. Eager KVM FPU restore should be enabled if the MPX feature is
exposed to VM.
Signed-off-by: Liang Li
Signed-off-by: Yang Zhang
---
arch/x86
The MPX feature requires eager KVM FPU restore support. We have verified
that MPX cannot work correctly with the current lazy KVM FPU restore
mechanism. Eager KVM FPU restore should be enabled if the MPX feature is
exposed to VM.
Signed-off-by: Liang Li
Signed-off-by: Yang Zhang
---
arch/x86
t during live migration.
Liang Li (2):
mm: add the related functions to build the free page bitmap
virtio-balloon: extend balloon driver to support the new feature
drivers/virtio/virtio_balloon.c | 100 ++--
fs/drop_caches.c| 22 +
Extend the virtio balloon to support the new feature
VIRTIO_BALLOON_F_GET_FREE_PAGES, so that we can use it to send
the free page bitmap from guest to QEMU, the free page bitmap will
be used for live migration optimization.
Signed-off-by: Liang Li
---
drivers/virtio/virtio_balloon.c | 100
The free page bitmap will be sent to QEMU through virtio interface
and used for live migration optimization.
Drop the cache before building the free page bitmap can get more
free pages. Whether dropping the cache is decided by user.
Signed-off-by: Liang Li
---
fs/drop_caches.c | 22
There are two duplicated xenvif_zerocopy_callback() definitions.
Remove one of them.
Signed-off-by: Liang Li
---
drivers/net/xen-netback/common.h | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 8a495b3..c6cb85a
Support the request for vm's free page information, response with
a page bitmap. QEMU can make use of this free page bitmap to speed
up live migration process by skipping process the free pages.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Andrew Morton
Cc: Vlastimil Babka
Cc
Changes from v1 to v2:
* Abandon the patch for dropping page cache.
* Put some structures to uapi head file.
* Use a new way to determine the page bitmap size.
* Use a unified way to send the free page information with the bitmap
* Address the issues referred in MST's co
about the page bitmap. e.g. the page size, page bitmap length and
start pfn.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
include/uapi/linux/virtio_balloon.h | 19 +++
1 file changed, 19 insertions(+)
diff --git a/include
Expose the function to get the max pfn, so it can be used in the
virtio-balloon device driver.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Vlastimil Babka
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
mm/page_alloc.c | 6 ++
1 file
Save the free page info into a page bitmap, will be used in virtio
balloon device driver.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Vlastimil Babka
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
mm/page_alloc.c | 46
will allow faster notifications using a bitmap down the road.
balloon_pfn_to_page() can be removed because it's useless.
Signed-off-by: Liang Li
Signed-off-by: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
drivers/virtio/virtio_balloon.c
ture, inflating the
balloon to 7GB of a 8GB idle guest only takes 590ms, the
performance improvement is about 85%.
TODO: optimize stage a by allocating/freeing a chunk of pages
instead of a single page at a time.
Signed-off-by: Liang Li
Suggested-by: Michael S. Tsirkin
Cc: Michael S. Tsirkin
Cc: An
VMM hypervisor can get some
of guest's runtime information through this virtual queue, e.g. the
guest's free page information, which can be used for live migration
optimization.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
in
ge information with the bitmap
* Address the issues referred in MST's comments
Liang Li (7):
virtio-balloon: rework deflate to add page to a list
virtio-balloon: define new feature bit and page bitmap head
mm: add a function to get the max pfn
virtio-balloon: speed up inflate/d
about the page bitmap. e.g. the page size, page bitmap length and
start pfn.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
include/uapi/linux/virtio_balloon.h | 19 +++
1 file changed, 19 insertions(+)
diff --git a/include
corrected by the dirty
page logging mechanism.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
include/linux/mm.h | 2 ++
mm/page_alloc.c| 84 ++
2
Will allow faster notifications using a bitmap down the road.
balloon_pfn_to_page() can be removed because it's useless.
Signed-off-by: Liang Li
Signed-off-by: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
drivers/virtio/virtio_balloon.c
VMM hypervisor can get some
of guest's runtime information through this virtual queue, e.g. the
guest's unused page information, which can be used for live migration
optimization.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
---
in
ture, inflating the
balloon to 7GB of a 8GB idle guest only takes 590ms, the
performance improvement is about 85%.
TODO: optimize stage a by allocating/freeing a chunk of pages
instead of a single page at a time.
Signed-off-by: Liang Li
Suggested-by: Michael S. Tsirkin
Cc: Michael S. Tsirkin
Cc: P
Expose the function to get the max pfn, so it can be used in the
virtio-balloon device driver. Simply include the 'linux/bootmem.h'
is not enough, if the device driver is built to a module, directly
refer the max_pfn lead to build failed.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc:
Support the request for vm's unused page information, response with
a page bitmap. QEMU can make use of this bitmap and the dirty page
logging mechanism to skip the transportation of these unused pages,
this is very helpful to speed up the live migration process.
Signed-off-by: Liang L
of the PFN array,
which will allow faster notifications using a bitmap down the road.
balloon_pfn_to_page() can be removed because it's useless.
Signed-off-by: Liang Li
Signed-off-by: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
---
driver
che.
* Put some structures to uapi head file.
* Use a new way to determine the page bitmap size.
* Use a unified way to send the free page information with the bitmap
* Address the issues referred in MST's comments
Liang Li (7):
virtio-balloon: rework deflate to add page to a l
about the page bitmap. e.g. the page size, page bitmap length and
start pfn.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
---
include/uapi/linux/virtio_balloon.h | 19 +++
1 file changed, 19 insertions(+)
diff
ation process.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
---
drivers/virtio/virtio_balloon.c | 128 +---
1 file changed, 121 insertions(+), 7 deletions(-)
diff --git a/drivers/v
can be corrected by the dirty
page logging mechanism.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
---
include/linux/mm.h | 2 ++
mm/page_alloc.c| 85
Expose the function to get the max pfn, so it can be used in the
virtio-balloon device driver. Simply include the 'linux/bootmem.h'
is not enough, if the device driver is built to a module, directly
refer the max_pfn lead to build failed.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc:
hypervisor can get some of guest's runtime information
through this virtual queue too, e.g. the guest's unused page
information, which can be used for live migration optimization.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc
ture, inflating the
balloon to 7GB of a 8GB idle guest only takes 590ms, the
performance improvement is about 85%.
TODO: optimize stage a by allocating/freeing a chunk of pages
instead of a single page at a time.
Signed-off-by: Liang Li
Suggested-by: Michael S. Tsirkin
Cc: Michael S. Tsirkin
Cc: P
new feature, inflating the
balloon to 7GB of a 8GB idle guest only takes 590ms, the
performance improvement is about 85%.
TODO: optimize stage a by allocating/freeing a chunk of pages
instead of a single page at a time.
Signed-off-by: Liang Li
Suggested-by: Michael S. Tsirkin
Cc: Michael S. Tsirkin
ew way to determine the page bitmap size.
* Use a unified way to send the free page information with the bitmap
* Address the issues referred in MST's comments
Liang Li (5):
virtio-balloon: rework deflate to add page to a list
virtio-balloon: define new feature bit and head struct
pfn|length} down the
road. balloon_pfn_to_page() can be removed because it's useless.
Signed-off-by: Liang Li
Signed-off-by: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
Cc: Andrea Arcangeli
Cc: David Hildenbrand
---
drivers/virtio/virtio_balloo
Add a new feature which supports sending the page information
with range array. The current implementation uses PFNs array,
which is not very efficient. Using ranges can improve the
performance of inflating/deflating significantly.
Signed-off-by: Liang Li
Cc: Michael S. Tsirkin
Cc: Paolo
hypervisor can get some of guest's runtime information
through this virtual queue too, e.g. the guest's unused page
information, which can be used for live migration optimization.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc
nused
pages, this is very helpful to reduce the network traffic and speed
up the live migration process.
Signed-off-by: Liang Li
Cc: Andrew Morton
Cc: Mel Gorman
Cc: Michael S. Tsirkin
Cc: Paolo Bonzini
Cc: Cornelia Huck
Cc: Amit Shah
Cc: Dave Hansen
Cc: Andrea Arcangeli
Cc: David Hilden
Signed-off-by: Liang Li
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Kirill A. Shutemov
Cc: Dave Hansen
Cc: Xiao Guangrong
Cc: Paolo Bonzini
Cc: "Radim Kr??m"
---
arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/include/uapi/asm/processor-flags.h | 2 ++
2 files changed, 3
1 - 100 of 135 matches
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