Gerd Hoffmann wrote:
Izik Eidus wrote:
The main problem that ksm will face when removing the fd interface is:
right now when you register memory into ksm, you open fd, and then ksm
do get_task_mm(), we will do mmput when the file will be closed
Did you test whenever it really cleans
of this issue is that newpage cannot be anything but
kernel allocated page that is not swappable.
Signed-off-by: Izik Eidus
---
include/linux/mm.h |5 +++
mm/memory.c| 80
2 files changed, 85 insertions(+), 0 deletions(-)
diff --
while another thread read
and writes to/from the first 512bytes of the page. We can lose
O_DIRECT reads, the very moment we mark any pte wrprotected..."
Signed-off-by: Izik Eidus
---
include/linux/rmap.h | 11
mm/rmap.c| 139 +
.
(users of mmu_notifiers that didnt implement the set_pte_at_notify()
call back will just recive the mmu_notifier_invalidate_page callback)
Signed-off-by: Izik Eidus
---
include/linux/mmu_notifier.h | 34 ++
mm/memory.c | 10 --
mm
en fork it N times, to have the data shared.
With KSM this would be done automatically by the system so it sounded extremely
attractive when Andrea presented it."
I am sending another seires of patchs for kvm kernel and kvm-userspace
that would allow users of kvm to test ksm with
pages to share inside this memory region.
__u32 pad;
__u64 addr:
the begining of the virtual address of this region.
__u64 reserved_bits;
reserved bits for future usage.
KSM_REMOVE_MEMORY_REGION:
Remove memory region from ksm.
Signed-off-by: Izik Eidus
---
include/linux/ksm.h
Andrey Panin wrote:
On 094, 04 04, 2009 at 05:35:22PM +0300, Izik Eidus wrote:
+static inline u32 calc_checksum(struct page *page)
+{
+ u32 checksum;
+ void *addr = kmap_atomic(page, KM_USER0);
+ checksum = jhash(addr, PAGE_SIZE, 17);
Why jhash2() is not used here
e number of pages that have been
shared, you can run top as well)
On Sat, Apr 04, 2009 at 05:35:18PM +0300, Izik Eidus wrote:
From v1 to v2:
1)Fixed security issue found by Chris Wright:
Ksm was checking if page is a shared page by running !PageAnon.
Beacuse that Ksm scan only anony
Nick Piggin wrote:
On Sunday 05 April 2009 01:35:18 Izik Eidus wrote:
This driver is very useful for KVM as in cases of runing multiple guests
operation system of the same type.
(For desktop work loads we have achived more than x2 memory overcommit
(more like x3))
Interesting that it
of this issue is that newpage cannot be anything but
kernel allocated page that is not swappable.
Signed-off-by: Izik Eidus
---
include/linux/mm.h |5 +++
mm/memory.c| 80
2 files changed, 85 insertions(+), 0 deletions(-)
diff --
.
(users of mmu_notifiers that didnt implement the set_pte_at_notify()
call back will just recive the mmu_notifier_invalidate_page callback)
Signed-off-by: Izik Eidus
---
include/linux/mmu_notifier.h | 34 ++
mm/memory.c | 10 --
mm
tractive when Andrea presented it."
I am sending another seires of patchs for kvm kernel and kvm-userspace
that would allow users of kvm to test ksm with it.
The kvm patchs would apply to Avi git tree.
Izik Eidus (4):
MMU_NOTIFIERS: add set_pte_at_notify()
add page_wrprotect(): write p
while another thread read
and writes to/from the first 512bytes of the page. We can lose
O_DIRECT reads, the very moment we mark any pte wrprotected..."
Signed-off-by: Izik Eidus
---
include/linux/rmap.h | 11
mm/rmap.c| 139 +
pages to share inside this memory region.
__u32 pad;
__u64 addr:
the begining of the virtual address of this region.
__u64 reserved_bits;
reserved bits for future usage.
KSM_REMOVE_MEMORY_REGION:
Remove memory region from ksm.
Signed-off-by: Izik Eidus
Signed-off-by: Chris Wright
Marcelo Tosatti wrote:
On Tue, Mar 31, 2009 at 03:00:02AM +0300, Izik Eidus wrote:
When using mmu notifiers, we are allowed to remove the page count
reference tooken by get_user_pages to a specific page that is mapped
inside the shadow page tables.
This is needed so we can balance the
Marcelo Tosatti wrote:
On Tue, Mar 31, 2009 at 03:00:03AM +0300, Izik Eidus wrote:
this flag notify that the host physical page we are pointing to from
the spte is write protected, and therefore we cant change its access
to be write unless we run get_user_pages(write = 1).
(this is needed
Izik Eidus wrote:
Marcelo Tosatti wrote:
On Tue, Mar 31, 2009 at 03:00:02AM +0300, Izik Eidus wrote:
When using mmu notifiers, we are allowed to remove the page count
reference tooken by get_user_pages to a specific page that is mapped
inside the shadow page tables.
This is needed so we can
Andrew Morton wrote:
On Thu, 9 Apr 2009 06:58:41 +0300
Izik Eidus wrote:
Confused. In the covering email you indicated that v2 of the patchset
had abandoned ioctls and had moved the interface to sysfs.
We have abandoned the ioctls that control the ksm behavior (how much cpu
it take
Andrea Arcangeli wrote:
On Tue, Apr 14, 2009 at 03:09:25PM -0700, Andrew Morton wrote:
On Thu, 9 Apr 2009 06:58:40 +0300
Izik Eidus wrote:
replace_page() allow changing the mapping of pte from one physical page
into diffrent physical page.
At a high level, this is very
Jeremy Fitzhardinge wrote:
Andrew Morton wrote:
+static pte_t *get_pte(struct mm_struct *mm, unsigned long addr)
+{
+pgd_t *pgd;
+pud_t *pud;
+pmd_t *pmd;
+pte_t *ptep = NULL;
+
+pgd = pgd_offset(mm, addr);
+if (!pgd_present(*pgd))
+goto out;
+
+pud = pud_offs
Nick Piggin wrote:
On Wednesday 15 April 2009 08:09:03 Andrew Morton wrote:
On Thu, 9 Apr 2009 06:58:37 +0300
Izik Eidus wrote:
KSM is a linux driver that allows dynamicly sharing identical memory
pages between one or more processes.
Generally looks OK to me. But that
gt; /sys/kernel/mm/ksm/run
(Or any other numbers...)
Ok, you are ready :-)
(Just remember, memory that is swapped, isnt scanned by ksm until it
come back to memory, so dont try to raise alot of VMS togather)
Thanks.
Izik Eidus (5):
MMU_NOTIFIERS: add set_pte_at_notify()
add get_pte(): hel
.
(users of mmu_notifiers that didnt implement the set_pte_at_notify()
call back will just recive the mmu_notifier_invalidate_page callback)
Signed-off-by: Izik Eidus
---
include/linux/mmu_notifier.h | 34 ++
mm/memory.c | 10 --
mm
get_pte() receive mm_struct of a task, and a virtual address and return
the pte corresponding to it.
this function return NULL in case it couldnt fetch the pte.
Signed-off-by: Izik Eidus
---
include/linux/mm.h | 24
1 files changed, 24 insertions(+), 0 deletions
of this issue is that newpage cannot be anything but
kernel allocated page that is not swappable.
Signed-off-by: Izik Eidus
---
include/linux/mm.h |5 +++
mm/memory.c| 80
2 files changed, 85 insertions(+), 0 deletions(-)
diff --
and will fork them
when write access will happen to them.
Ksm scan just memory areas that were registred to be scanned by it.
Signed-off-by: Izik Eidus
Signed-off-by: Chris Wright
Signed-off-by: Andrea Arcangeli
---
include/linux/ksm.h| 48 ++
include/linux/miscdevice.h |1 +
mm
while another thread read
and writes to/from the first 512bytes of the page. We can lose
O_DIRECT reads, the very moment we mark any pte wrprotected..."
Signed-off-by: Izik Eidus
---
include/linux/rmap.h | 11
mm/rmap.c| 139 +
Avi Kivity wrote:
Alan Cox wrote:
The minor number you are using already belongs to another project.
10,234 is free but it would be good to know what device naming is
proposed. I imagine other folks would like to know why you aren't using
sysfs or similar or extending /dev/kvm ?
ksm was de
Andrew Morton wrote:
On Mon, 20 Apr 2009 04:36:06 +0300
Izik Eidus wrote:
Ksm is driver that allow merging identical pages between one or more
applications in way unvisible to the application that use it.
Pages that are merged are marked as readonly and are COWed when any
application try
On Tue, 28 Apr 2009 02:12:00 +0300
Izik Eidus wrote:
> Andrew Morton wrote:
> > Breaks sparc64 and probably lots of other architectures:
> >
> > mm/ksm.c: In function `try_to_merge_two_pages_alloc':
> > mm/ksm.c:697: error: `_PAGE_RW' undeclared (first us
Anthony Liguori wrote:
Chris Wright wrote:
* Andrew Morton (a...@linux-foundation.org) wrote:
Breaks ppc64 allmodcofnig because that architecture doesn't export its
copy_user_page() to modules.
Things like this and updating to use madvise() I think all point towards
s/tristate/bool/.
Andrew Morton wrote:
On Mon, 20 Apr 2009 04:36:06 +0300
Izik Eidus wrote:
Ksm is driver that allow merging identical pages between one or more
applications in way unvisible to the application that use it.
Pages that are merged are marked as readonly and are COWed when any
application try
On Tue, 09 Feb 2010 12:51:47 +0200
Avi Kivity wrote:
> On 02/01/2010 12:37 PM, Nikola Ciprich wrote:
> > Hello,
> > it seems to me that after upgrading to some 2.6.32.x release, KSM stopped
> > working
> > for me. I'm not exactly sure which update did this, but enabling KSM doesn't
> > seem to d
ode already have timer
that is set, so it like it make the most sense to use it...
If anyone have any better idea how to solve this issue, I will be very
happy to hear.
Thanks.
>From 2d9c25f1fee61f50cb130769c3779707a6ef90d9 Mon Sep 17 00:00:00 2001
From: Izik Eidus
Date: Mon, 5 Apr 2010 02:05:09
>From f94dcd1ccabbcdb51ed7c37c5f58f00a5c1b7eec Mon Sep 17 00:00:00 2001
From: Izik Eidus
Date: Mon, 25 Jan 2010 15:49:41 +0200
Subject: [PATCH] RFC: alias rework
This patch remove the old way of aliasing inside kvm
and move into using aliasing with the same virtual addresses
This patch
On Mon, 25 Jan 2010 17:45:53 -0200
Marcelo Tosatti wrote:
> Izik,
>
> On Mon, Jan 25, 2010 at 03:53:44PM +0200, Izik Eidus wrote:
> > >From f94dcd1ccabbcdb51ed7c37c5f58f00a5c1b7eec Mon Sep 17 00:00:00 2001
> > From: Izik Eidus
> > Date: Mon, 25 Jan 2010 15:49:41
On Mon, 25 Jan 2010 18:20:39 -0200
Marcelo Tosatti wrote:
> With current code, if a memslot is deleted, access through any aliases
> that use it will fail (BTW it looks this is not properly handled, but
> thats a separate problem).
Yea I had some still open concerns about this code (this why I
On Mon, 25 Jan 2010 18:49:25 -0200
Marcelo Tosatti wrote:
> On Mon, Jan 25, 2010 at 10:40:32PM +0200, Izik Eidus wrote:
> > On Mon, 25 Jan 2010 18:20:39 -0200
> > Marcelo Tosatti wrote:
> >
> > > With current code, if a memslot is deleted, access through any alias
On Tue, 26 Jan 2010 16:14:47 +0200
Avi Kivity wrote:
> On 01/25/2010 10:40 PM, Izik Eidus wrote:
> >
> >> Or is this a feature you need?
> >>
> >
> > I dont need it (I asked Avi to do something), So he said he want to nuke
> > the alia
Remove the vmap usage from kvm, this is needed both for ksm and
get_user_pages != write.
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This commit change the name of emulator_read_std into kvm_read_guest_virt,
and add new function name kvm_write_guest_virt that allow writing into a
guest virtual address.
Signed-off-by: Izik Eidus
---
arch/x86/include/asm/kvm_host.h |4 ---
arch/x86/kvm/x86.c | 56
Signed-off-by: Izik Eidus
---
arch/x86/kvm/x86.c| 62 +---
include/linux/kvm_types.h |3 +-
2 files changed, 14 insertions(+), 51 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c812209..29df564 100644
--- a/arch/x86
Izik Eidus wrote:
Remove the vmap usage from kvm, this is needed both for ksm and
get_user_pages != write.
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kind of simple, i would send one to qemu later (need to check something
first
Spice need this, it allow more memory cache (badly needed when runing
with multiple screens)
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More m
maximum memory that would be
avaible now is 3giga.
Signed-off-by: Izik Eidus
---
bios/acpi-dsdt.dsl |2 +-
bios/rombios.c |2 +-
bios/rombios32.c| 10 +-
qemu/hw/pc.c|6 +++---
qemu/hw/vga_int.h |2 +-
qemu/hw
Chris Wright wrote:
* Izik Eidus (iei...@redhat.com) wrote:
This patch make the pci mem region larger (1 giga now).
this is needed for pci devices that require large amount of memory
such as video cards.
for pea guests this patch is not an issue beacuse the guest OS will map
the rest of the
Alexander Graf wrote:
Hi,
On 25.01.2009, at 09:16, Neo Jia wrote:
hi,
I am thinking if it is possible to port KVM to Mac OS (leopard). Is
there anybody doing this already?
I've considered doing it, but haven't gotten around to it, due to lack
of inspiration.
The biggest problem IMHO is the
Marcelo Tosatti wrote:
On Thu, Mar 12, 2009 at 06:18:43PM +0100, Andrea Arcangeli wrote:
From: Andrea Arcangeli
While looking at invlpg out of sync code with Izik I think I noticed a
missing smp tlb flush here. Without this the other cpu can still write
to a freed host physical page. tlb sm
ציטוט Arn:
Hi,
If I use the kernel function "get_user_pages()" within a guest kernel
module, will this ensure that the
guests pages are never swapped out by the host ? Will it lock these
pages in memory ?
(Has anyone tried this ? )
Thanks
Arn
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ציטוט Arn:
If I use the kernel function "get_user_pages()" within a guest
kernel module, will this ensure that the guests pages are never
swapped out by the host ? Will it lock these pages in memory ?
(Has anyone tried this ? )
As Izik said, the answer is no. Is this the desirable outcome
ציטוט Sukanto Ghosh:
Can anyone answer these queries regarding KSM ?
How does KSM offers its services through the /dev/ksm device ?
ioctls
Are every guest pages scanned in KVM while using KSM or page-scanning
and sharing is triggered on some event (low memory, etc) ?
no, the scanning r
ציטוט Sukanto Ghosh:
Are every guest pages scanned in KVM while using KSM or page-scanning
and sharing is triggered on some event (low memory, etc) ?
no, the scanning run all the time (with number pages to scan and sleep
parameters...)
Does the scanner(s) run as separate kernel th
ציטוט Sukanto Ghosh:
Doesn't KSM notifies KVM about the shared pages so that KVM can update
its sptes accordingly or is it done by KSM itself ?
when using kvm, mmu notifiers is a must for ksm, (mmu notifiers update kvm
about the changes in the host page table)
What about KSM being
ציטוט Sukanto Ghosh:
One more query, what if multiple processes call ioctl KSM_CREATE_SCAN
? Will there be multiple scanners ?
yes
Consider a scenario where two processes A & B separately call
KSM_CREATE_SCAN and then start registering some memory pages/areas via
KSM_CREATE_SHARED_MEMORY_AR
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