search for: config_page_poisoning_zero

...) diff --git a/include/linux/poison.h b/include/linux/poison.h index 15927eb..348bf67 100644 --- a/include/linux/poison.h +++ b/include/linux/poison.h @@ -30,13 +30,6 @@ */ #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) -/********** mm/debug-pagealloc.c **********/ -#ifdef CONFIG_PAGE_POISONING_ZERO -#define PAGE_POISON 0x00 -#else -#define PAGE_POISON 0xaa -#endif - /********** mm/page_alloc.c ************/ #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) diff --git a/mm/page_poison.c b/mm/page_poison.c index e83fd44..8aaf076 100644 --- a/mm/page_poison.c +++ b/mm/page_poison....

...) diff --git a/include/linux/poison.h b/include/linux/poison.h index 15927eb..348bf67 100644 --- a/include/linux/poison.h +++ b/include/linux/poison.h @@ -30,13 +30,6 @@ */ #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) -/********** mm/debug-pagealloc.c **********/ -#ifdef CONFIG_PAGE_POISONING_ZERO -#define PAGE_POISON 0x00 -#else -#define PAGE_POISON 0xaa -#endif - /********** mm/page_alloc.c ************/ #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) diff --git a/mm/page_poison.c b/mm/page_poison.c index e83fd44..8aaf076 100644 --- a/mm/page_poison.c +++ b/mm/page_poison....

...ude/linux/poison.h > index 15927eb..348bf67 100644 > --- a/include/linux/poison.h > +++ b/include/linux/poison.h > @@ -30,13 +30,6 @@ > */ > #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) > > -/********** mm/debug-pagealloc.c **********/ > -#ifdef CONFIG_PAGE_POISONING_ZERO > -#define PAGE_POISON 0x00 > -#else > -#define PAGE_POISON 0xaa > -#endif > - > /********** mm/page_alloc.c ************/ > > #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) > diff --git a/mm/page_poison.c b/mm/page_poison.c > index e83fd44..8aaf076 1...

...OC diff --git a/include/linux/poison.h b/include/linux/poison.h index 15927eb..348bf67 100644 --- a/include/linux/poison.h +++ b/include/linux/poison.h @@ -30,13 +30,6 @@ */ #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) -/********** mm/debug-pagealloc.c **********/ -#ifdef CONFIG_PAGE_POISONING_ZERO -#define PAGE_POISON 0x00 -#else -#define PAGE_POISON 0xaa -#endif - /********** mm/page_alloc.c ************/ #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) diff --git a/mm/page_poison.c b/mm/page_poison.c index e83fd44..9a07973 100644 --- a/mm/page_poison.c +++ b/mm/page_poison....

...e inform it via the poison feature, if > possible. This discussion is about "what happens if the poison feature > is not there, but we do have want_init_on_free()." My preference is to err on the side of caution. I view want_init_on free() as equivalent to page_poison_enabled with CONFIG_PAGE_POISONING_ZERO and treated the same way. So if we are going to let one by then we would want to let the other by as well. > > want_init_on_free rather than not providing that information to QEMU. > > This way, if in the future we decide to change the implementation in > > some way that might ef...

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

On Mon, Apr 27, 2020 at 1:08 AM David Hildenbrand <david at redhat.com> wrote: > > On 24.04.20 18:24, Alexander Duyck wrote: > > From: Alexander Duyck <alexander.h.duyck at linux.intel.com> > > > > We should disable free page reporting if page poisoning is enabled in the > > kernel but we cannot report it via the balloon interface. This way we can >

On Mon, Apr 27, 2020 at 1:08 AM David Hildenbrand <david at redhat.com> wrote: > > On 24.04.20 18:24, Alexander Duyck wrote: > > From: Alexander Duyck <alexander.h.duyck at linux.intel.com> > > > > We should disable free page reporting if page poisoning is enabled in the > > kernel but we cannot report it via the balloon interface. This way we can >

...bugging Instruments CONFIG_DEBUG_KERNEL=y # CONFIG_DEBUG_MISC is not set # # Memory Debugging # CONFIG_PAGE_EXTENSION=y CONFIG_DEBUG_PAGEALLOC=y # CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT is not set # CONFIG_PAGE_OWNER is not set CONFIG_PAGE_POISONING=y # CONFIG_PAGE_POISONING_NO_SANITY is not set # CONFIG_PAGE_POISONING_ZERO is not set CONFIG_DEBUG_PAGE_REF=y # CONFIG_DEBUG_RODATA_TEST is not set CONFIG_GENERIC_PTDUMP=y CONFIG_PTDUMP_CORE=y # CONFIG_PTDUMP_DEBUGFS is not set CONFIG_DEBUG_OBJECTS=y CONFIG_DEBUG_OBJECTS_SELFTEST=y CONFIG_DEBUG_OBJECTS_FREE=y CONFIG_DEBUG_OBJECTS_TIMERS=y # CONFIG_DEBUG_OBJECTS_WORK is no...

...ot set # end of Generic Kernel Debugging Instruments CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_MISC=y # # Memory Debugging # CONFIG_PAGE_EXTENSION=y CONFIG_DEBUG_PAGEALLOC=y CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y # CONFIG_PAGE_OWNER is not set CONFIG_PAGE_POISONING=y CONFIG_PAGE_POISONING_NO_SANITY=y # CONFIG_PAGE_POISONING_ZERO is not set CONFIG_DEBUG_PAGE_REF=y # CONFIG_DEBUG_RODATA_TEST is not set CONFIG_GENERIC_PTDUMP=y # CONFIG_PTDUMP_DEBUGFS is not set # CONFIG_DEBUG_OBJECTS is not set # CONFIG_SLUB_DEBUG_ON is not set CONFIG_SLUB_STATS=y CONFIG_HAVE_DEBUG_KMEMLEAK=y # CONFIG_DEBUG_KMEMLEAK is not set CONFIG_DEBUG_ST...

...ot set # end of Generic Kernel Debugging Instruments CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_MISC=y # # Memory Debugging # CONFIG_PAGE_EXTENSION=y CONFIG_DEBUG_PAGEALLOC=y CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y # CONFIG_PAGE_OWNER is not set CONFIG_PAGE_POISONING=y CONFIG_PAGE_POISONING_NO_SANITY=y # CONFIG_PAGE_POISONING_ZERO is not set CONFIG_DEBUG_PAGE_REF=y # CONFIG_DEBUG_RODATA_TEST is not set CONFIG_GENERIC_PTDUMP=y # CONFIG_PTDUMP_DEBUGFS is not set # CONFIG_DEBUG_OBJECTS is not set # CONFIG_SLUB_DEBUG_ON is not set CONFIG_SLUB_STATS=y CONFIG_HAVE_DEBUG_KMEMLEAK=y # CONFIG_DEBUG_KMEMLEAK is not set CONFIG_DEBUG_ST...

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

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

...R=y # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 CONFIG_MAGIC_SYSRQ_SERIAL=y CONFIG_DEBUG_KERNEL=y # # Memory Debugging # CONFIG_PAGE_EXTENSION=y # CONFIG_DEBUG_PAGEALLOC is not set CONFIG_PAGE_POISONING=y CONFIG_PAGE_POISONING_NO_SANITY=y CONFIG_PAGE_POISONING_ZERO=y CONFIG_DEBUG_PAGE_REF=y # CONFIG_DEBUG_RODATA_TEST is not set CONFIG_DEBUG_OBJECTS=y CONFIG_DEBUG_OBJECTS_SELFTEST=y CONFIG_DEBUG_OBJECTS_FREE=y # CONFIG_DEBUG_OBJECTS_TIMERS is not set # CONFIG_DEBUG_OBJECTS_WORK is not set # CONFIG_DEBUG_OBJECTS_RCU_HEAD is not set CONFIG_DEBUG_OBJECTS_PERCPU_C...

...R=y # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 CONFIG_MAGIC_SYSRQ_SERIAL=y CONFIG_DEBUG_KERNEL=y # # Memory Debugging # CONFIG_PAGE_EXTENSION=y # CONFIG_DEBUG_PAGEALLOC is not set CONFIG_PAGE_POISONING=y CONFIG_PAGE_POISONING_NO_SANITY=y CONFIG_PAGE_POISONING_ZERO=y CONFIG_DEBUG_PAGE_REF=y # CONFIG_DEBUG_RODATA_TEST is not set CONFIG_DEBUG_OBJECTS=y CONFIG_DEBUG_OBJECTS_SELFTEST=y CONFIG_DEBUG_OBJECTS_FREE=y # CONFIG_DEBUG_OBJECTS_TIMERS is not set # CONFIG_DEBUG_OBJECTS_WORK is not set # CONFIG_DEBUG_OBJECTS_RCU_HEAD is not set CONFIG_DEBUG_OBJECTS_PERCPU_C...

...G_DEBUG_FORCE_WEAK_PER_CPU is not set CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 CONFIG_MAGIC_SYSRQ_SERIAL=y CONFIG_DEBUG_KERNEL=y # # Memory Debugging # CONFIG_PAGE_EXTENSION=y # CONFIG_DEBUG_PAGEALLOC is not set CONFIG_PAGE_POISONING=y # CONFIG_PAGE_POISONING_NO_SANITY is not set CONFIG_PAGE_POISONING_ZERO=y CONFIG_DEBUG_RODATA_TEST=y # CONFIG_DEBUG_OBJECTS is not set CONFIG_DEBUG_SLAB=y # CONFIG_DEBUG_SLAB_LEAK is not set CONFIG_HAVE_DEBUG_KMEMLEAK=y # CONFIG_DEBUG_KMEMLEAK is not set CONFIG_DEBUG_STACK_USAGE=y CONFIG_DEBUG_VM=y CONFIG_DEBUG_VM_VMACACHE=y CONFIG_DEBUG_VM_RB=y # CONFIG_DEBUG_VM_PGFLA...

...t # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 CONFIG_MAGIC_SYSRQ_SERIAL=y CONFIG_DEBUG_KERNEL=y # # Memory Debugging # CONFIG_PAGE_EXTENSION=y # CONFIG_DEBUG_PAGEALLOC is not set CONFIG_PAGE_POISONING=y CONFIG_PAGE_POISONING_NO_SANITY=y # CONFIG_PAGE_POISONING_ZERO is not set # CONFIG_DEBUG_PAGE_REF is not set # CONFIG_DEBUG_RODATA_TEST is not set # CONFIG_DEBUG_OBJECTS is not set # CONFIG_DEBUG_SLAB is not set CONFIG_HAVE_DEBUG_KMEMLEAK=y # CONFIG_DEBUG_KMEMLEAK is not set CONFIG_DEBUG_STACK_USAGE=y CONFIG_DEBUG_VM=y CONFIG_DEBUG_VM_VMACACHE=y # CONFIG_DEBUG...

...t # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 CONFIG_MAGIC_SYSRQ_SERIAL=y CONFIG_DEBUG_KERNEL=y # # Memory Debugging # CONFIG_PAGE_EXTENSION=y # CONFIG_DEBUG_PAGEALLOC is not set CONFIG_PAGE_POISONING=y CONFIG_PAGE_POISONING_NO_SANITY=y # CONFIG_PAGE_POISONING_ZERO is not set # CONFIG_DEBUG_PAGE_REF is not set # CONFIG_DEBUG_RODATA_TEST is not set # CONFIG_DEBUG_OBJECTS is not set # CONFIG_DEBUG_SLAB is not set CONFIG_HAVE_DEBUG_KMEMLEAK=y # CONFIG_DEBUG_KMEMLEAK is not set CONFIG_DEBUG_STACK_USAGE=y CONFIG_DEBUG_VM=y CONFIG_DEBUG_VM_VMACACHE=y # CONFIG_DEBUG...

...SYSRQ=y > CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 > CONFIG_MAGIC_SYSRQ_SERIAL=y > CONFIG_DEBUG_KERNEL=y > > # > # Memory Debugging > # > CONFIG_PAGE_EXTENSION=y > # CONFIG_DEBUG_PAGEALLOC is not set > CONFIG_PAGE_POISONING=y > CONFIG_PAGE_POISONING_NO_SANITY=y > # CONFIG_PAGE_POISONING_ZERO is not set > # CONFIG_DEBUG_PAGE_REF is not set > # CONFIG_DEBUG_RODATA_TEST is not set > # CONFIG_DEBUG_OBJECTS is not set > # CONFIG_DEBUG_SLAB is not set > CONFIG_HAVE_DEBUG_KMEMLEAK=y > # CONFIG_DEBUG_KMEMLEAK is not set > CONFIG_DEBUG_STACK_USAGE=y > CONFIG_DEBUG_VM=y &...