Ping?
On 04/30/2015 12:53 PM, Juergen Gross wrote:
Paravirtualized spinlocks produce some overhead even if the kernel is
running on bare metal. The main reason are the more complex locking
and unlocking functions. Especially unlocking is no longer just one
instruction but so complex
On 05/05/2015 07:21 PM, Jeremy Fitzhardinge wrote:
On 05/03/2015 10:55 PM, Juergen Gross wrote:
I did a small measurement of the pure locking functions on bare metal
without and with my patches.
spin_lock() for the first time (lock and code not in cache) dropped from
about 600 to 500 cycles
On 04/30/2015 06:39 PM, Jeremy Fitzhardinge wrote:
On 04/30/2015 03:53 AM, Juergen Gross wrote:
Paravirtualized spinlocks produce some overhead even if the kernel is
running on bare metal. The main reason are the more complex locking
and unlocking functions. Especially unlocking is no longer
__ticket_check_and_clear_slowpath() and the slowpath flag isn't
set.
Signed-off-by: Juergen Gross jgr...@suse.com
---
arch/x86/include/asm/spinlock.h | 23 +++
1 file changed, 11 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm
For paravirtualized spinlocks setting the slowpath flag in
__ticket_enter_slowpath() is done via setting bit 0 in
lock-tickets.head instead of using a macro.
Change this by defining an appropriate macro.
Signed-off-by: Juergen Gross jgr...@suse.com
---
arch/x86/include/asm/spinlock.h | 3
pointer in order
to avoid spreading the knowledge which function to use.
Signed-off-by: Juergen Gross jgr...@suse.com
---
arch/x86/include/asm/paravirt.h | 7 +++
arch/x86/include/asm/paravirt_types.h | 1 +
arch/x86/include/asm/spinlock.h | 18 --
arch/x86/kernel/kvm.c
There is no need any more for a special treatment of _raw_spin_unlock()
regarding inlining compared to the other spinlock functions. Just treat
it like all the other spinlock functions.
Remove selecting UNINLINE_SPIN_UNLOCK in case of PARAVIRT_SPINLOCKS.
Signed-off-by: Juergen Gross jgr
are not dependant on the order of lock prefix and
paravirtualization patching as the sample instruction is subject to
lock prefix patching as well.
Signed-off-by: Juergen Gross jgr...@suse.com
---
arch/x86/include/asm/paravirt.h | 6 ++
arch/x86/include/asm/paravirt_types.h | 11 +++
arch
.
Correct patching verified by disassembly of active kernel.
Juergen Gross (6):
x86: use macro instead of 0 for setting TICKET_SLOWPATH_FLAG
x86: move decision about clearing slowpath flag into arch_spin_lock()
x86: introduce new pvops function clear_slowpath
x86: introduce new pvops function
With the paravirtualized spinlock unlock function being a pvops
function paravirt_ticketlocks_enabled is no longer needed. Remove it.
Signed-off-by: Juergen Gross jgr...@suse.com
---
arch/x86/include/asm/spinlock.h | 3 ---
arch/x86/kernel/kvm.c| 14 --
arch/x86
On 03/03/2015 08:20 PM, Luis R. Rodriguez wrote:
On Tue, Mar 3, 2015 at 2:06 AM, David Vrabel david.vra...@citrix.com wrote:
On 03/03/15 09:40, Luis R. Rodriguez wrote:
Andrey,
I believe that on Xen we should disable kasan, would like confirmation
Why? This is the first of heard of this.
, but it was rejected at that time. I wouldn't mind trying
it again if there is some support from your side. :-)
Juergen
--
Juergen Gross Principal Developer Operating Systems
PDG ESS SWE OS6 Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions e-mail
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