search for: arch_local_irq_enable

...unsigned long f) > { > PVOP_VCALLEE1(irq.restore_fl, f); > } > > -static inline notrace void arch_local_irq_disable(void) > +static inline noinstr void arch_local_irq_disable(void) > { > PVOP_VCALLEE0(irq.irq_disable); > } > > -static inline notrace void arch_local_irq_enable(void) > +static inline noinstr void arch_local_irq_enable(void) > { > PVOP_VCALLEE0(irq.irq_enable); > } > > -static inline notrace unsigned long arch_local_irq_save(void) > +static inline noinstr unsigned long arch_local_irq_save(void) > { > unsigned long f; &gt...

...page_fault+0x320/0x345 [354047.224054] [<ffffffff81003223>] ? xen_end_context_switch+0xe/0x1c [354047.224054] [<ffffffff81003ba5>] ? xen_mc_issue.constprop.23+0x31/0x49 [354047.224054] [<ffffffff8100d750>] ? __switch_to+0x1e5/0x258 [354047.224054] [<ffffffff81035bd7>] ? arch_local_irq_enable+0x7/0x8 [354047.224054] [<ffffffff81039a92>] ? finish_task_switch+0x4e/0xb9 [354047.224054] [<ffffffff8134f0e9>] ? __schedule+0x5f9/0x610 [354047.224054] [<ffffffff813509f5>] ? page_fault+0x25/0x30 [354047.224054] Code: 00 74 18 48 8d 74 24 0c bf 1b 00 00 00 e8 ab fb ff ff f6...

...1/0x49 Apr 16 16:02:25 hypervisor3 kernel: [2441115.678567] [<ffffffff8100d02f>] ? load_TLS+0x7/0xa Apr 16 16:02:25 hypervisor3 kernel: [2441115.678610] [<ffffffff8100d6a6>] ? __switch_to+0x13b/0x258 Apr 16 16:02:25 hypervisor3 kernel: [2441115.678656] [<ffffffff810359b7>] ? arch_local_irq_enable+0x7/0x8 Apr 16 16:02:25 hypervisor3 kernel: [2441115.678702] [<ffffffff81039834>] ? finish_task_switch+0x88/0xb9 Apr 16 16:02:25 hypervisor3 kernel: [2441115.678747] [<ffffffff8134c60c>] ? __schedule+0x5ac/0x5c3 Apr 16 16:02:25 hypervisor3 kernel: [2441115.678791] [<ffffffffa04...

...t; [354047.224054] [<ffffffff81003223>] ? xen_end_context_switch+0xe/0x1c > [354047.224054] [<ffffffff81003ba5>] ? > xen_mc_issue.constprop.23+0x31/0x49 > [354047.224054] [<ffffffff8100d750>] ? __switch_to+0x1e5/0x258 > [354047.224054] [<ffffffff81035bd7>] ? arch_local_irq_enable+0x7/0x8 > [354047.224054] [<ffffffff81039a92>] ? finish_task_switch+0x4e/0xb9 > [354047.224054] [<ffffffff8134f0e9>] ? __schedule+0x5f9/0x610 > [354047.224054] [<ffffffff813509f5>] ? page_fault+0x25/0x30 > [354047.224054] Code: 00 74 18 48 8d 74 24 0c bf 1b 00 00 00...

Setting the IF flag can cause an VM exit. So we should avoid touching the IF flag until absolutely necessary. This patch change the way the paravirt arch_local_irq_restore() works by checking the previous flags value and call arch_local_irq_enable() only if the IF flag was set previously. On a 32 vCPUs KVM guest running the AIM7 five-sec workload, the performance increased slightly from 302136.32 jobs/min to 306185.57 (about 1.3%) jobs/min and the %CPU time consumed by _raw_spin_unlock_irqrestore decreased slightly from 1.68% to 1.53% with...

Setting the IF flag can cause an VM exit. So we should avoid touching the IF flag until absolutely necessary. This patch change the way the paravirt arch_local_irq_restore() works by checking the previous flags value and call arch_local_irq_enable() only if the IF flag was set previously. On a 32 vCPUs KVM guest running the AIM7 five-sec workload, the performance increased slightly from 302136.32 jobs/min to 306185.57 (about 1.3%) jobs/min and the %CPU time consumed by _raw_spin_unlock_irqrestore decreased slightly from 1.68% to 1.53% with...

This changes the pv ops code generation to more closely match reality. For example, instead of: callq *0xffffffff81e3a400 (pv_irq_ops.save_fl) vmlinux will now show: pushfq pop %rax nop nop nop nop nop which is what the runtime version of the code will show in most cases. This idea was suggested by Andy Lutomirski. The benefits are: - For the most common runtime cases

This changes the pv ops code generation to more closely match reality. For example, instead of: callq *0xffffffff81e3a400 (pv_irq_ops.save_fl) vmlinux will now show: pushfq pop %rax nop nop nop nop nop which is what the runtime version of the code will show in most cases. This idea was suggested by Andy Lutomirski. The benefits are: - For the most common runtime cases

This series removes some no longer needed stuff from paravirt infrastructure and puts large quantities of paravirt ops under a new config option PARAVIRT_XXL which is selected by XEN_PV only. A pvops kernel without XEN_PV being configured is about 2.5% smaller with this series applied. tip commit 5800dc5c19f34e6e03b5adab1282535cb102fafd ("x86/paravirt: Fix spectre-v2 mitigations for

...ch+0xe/0x1c Jul 17 06:25:51 placka kernel: [34973.712086] [<ffffffff81003ba5>] ? xen_mc_issue.constprop.23+0x31/0x49 Jul 17 06:25:51 placka kernel: [34973.712086] [<ffffffff8100d750>] ? __switch_to+0x1e5/0x258 Jul 17 06:25:51 placka kernel: [34973.712086] [<ffffffff81035bd7>] ? arch_local_irq_enable+0x7/0x8 Jul 17 06:25:51 placka kernel: [34973.712086] [<ffffffff81039acc>] ? finish_task_switch+0x88/0xb9 Jul 17 06:25:51 placka kernel: [34973.712086] [<ffffffff8134f219>] ? __schedule+0x5f9/0x610 Jul 17 06:25:51 placka kernel: [34973.712086] [<ffffffff81350b35>] ? page_fault+...

Today paravirtualization is a all-or-nothing game: either a kernel is compiled with no paravirtualization support at all, or it is supporting paravirtualized environments like Xen pv-guests or lguest additionally to some paravirtualized tuning for KVM, Hyperv, VMWare or Xen HVM-guests. As support of pv-guests requires quite intrusive pv-hooks (e.g. all access functions to page table entries,

Today paravirtualization is a all-or-nothing game: either a kernel is compiled with no paravirtualization support at all, or it is supporting paravirtualized environments like Xen pv-guests or lguest additionally to some paravirtualized tuning for KVM, Hyperv, VMWare or Xen HVM-guests. As support of pv-guests requires quite intrusive pv-hooks (e.g. all access functions to page table entries,

This series removes some no longer needed stuff from paravirt infrastructure and puts large quantities of paravirt ops under a new config option PARAVIRT_XXL which is selected by XEN_PV only. A pvops kernel without XEN_PV being configured is about 2.5% smaller with this series applied. tip commit 5800dc5c19f34e6e03b5adab1282535cb102fafd ("x86/paravirt: Fix spectre-v2 mitigations for

Greetings, I got the below dmesg and the first bad commit is commit cf39c8e5352b4fb9efedfe7e9acb566a85ed847c Merge: 3398d25 23b7eaf Author: Linus Torvalds <torvalds@linux-foundation.org> Date: Wed Sep 4 17:45:39 2013 -0700 Merge tag ''stable/for-linus-3.12-rc0-tag'' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip Pull Xen updates from Konrad