search for: page_poisoning

...--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_po...

...--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_po...

...ux/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..8aaf...

On Wed, Feb 07, 2018 at 02:54:30PM +0800, Wei Wang wrote: > In some usages, e.g. virtio-balloon, a kernel module needs to know if > page poisoning is in use. This patch exposes the page_poisoning_enabled > function to kernel modules. > > Signed-off-by: Wei Wang <wei.w.wang at intel.com> > Cc: Andrew Morton <akpm at linux-foundation.org> > Cc: Michal Hocko <mhocko at kernel.org> > Cc: Michael S. Tsirkin <mst at redhat.com> > --- > mm/page_poi...

On Wed, Feb 07, 2018 at 02:54:30PM +0800, Wei Wang wrote: > In some usages, e.g. virtio-balloon, a kernel module needs to know if > page poisoning is in use. This patch exposes the page_poisoning_enabled > function to kernel modules. > > Signed-off-by: Wei Wang <wei.w.wang at intel.com> > Cc: Andrew Morton <akpm at linux-foundation.org> > Cc: Michal Hocko <mhocko at kernel.org> > Cc: Michael S. Tsirkin <mst at redhat.com> > --- > mm/page_poi...

...+ 3 files changed, 26 insertions(+), 7 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 1c77d88..d95e5d3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2469,11 +2469,13 @@ extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, extern bool page_poisoning_enabled(void); extern void kernel_poison_pages(struct page *page, int numpages, int enable); extern bool page_is_poisoned(struct page *page); +extern bool page_poison_val_get(u8 *val); #else static inline bool page_poisoning_enabled(void) { return false; } static inline void kernel_poison_page...

On 02/08/2018 02:34 AM, Michael S. Tsirkin wrote: > On Wed, Feb 07, 2018 at 02:54:30PM +0800, Wei Wang wrote: >> In some usages, e.g. virtio-balloon, a kernel module needs to know if >> page poisoning is in use. This patch exposes the page_poisoning_enabled >> function to kernel modules. >> >> Signed-off-by: Wei Wang <wei.w.wang at intel.com> >> Cc: Andrew Morton <akpm at linux-foundation.org> >> Cc: Michal Hocko <mhocko at kernel.org> >> Cc: Michael S. Tsirkin <mst at redhat.com> &gt...

In some usages, e.g. virtio-balloon, a kernel module needs to know if page poisoning is in use. This patch exposes the page_poisoning_enabled function to kernel modules. Signed-off-by: Wei Wang <wei.w.wang at intel.com> Cc: Andrew Morton <akpm at linux-foundation.org> Cc: Michal Hocko <mhocko at kernel.org> Cc: Michael S. Tsirkin <mst at redhat.com> --- mm/page_poison.c | 6 ++++++ 1 file changed, 6 inse...

In some usages, e.g. virtio-balloon, a kernel module needs to know if page poisoning is in use. This patch exposes the page_poisoning_enabled function to kernel modules. Signed-off-by: Wei Wang <wei.w.wang at intel.com> Cc: Andrew Morton <akpm at linux-foundation.org> Cc: Michal Hocko <mhocko at kernel.org> Cc: Michael S. Tsirkin <mst at redhat.com> --- mm/page_poison.c | 6 ++++++ 1 file changed, 6 inse...

...legacy case takes 5min14s to finish the compilation. With this optimization patched, it takes 5min12s. ChangeLog: v27->v28: - mm/page_poison: Move PAGE_POISON to page_poison.c and add a function to expose page poison val to kernel modules. v26->v27: - add a new patch to expose page_poisoning_enabled to kernel modules - virtio-balloon: set poison_val to 0xaaaaaaaa, instead of 0xaa v25->v26: virtio-balloon changes only - remove kicking free page vq since the host now polls the vq after initiating the reporting - report_free_page_func: detach all the used buffers afte...

...legacy case takes 5min14s to finish the compilation. With this optimization patched, it takes 5min12s. ChangeLog: v27->v28: - mm/page_poison: Move PAGE_POISON to page_poison.c and add a function to expose page poison val to kernel modules. v26->v27: - add a new patch to expose page_poisoning_enabled to kernel modules - virtio-balloon: set poison_val to 0xaaaaaaaa, instead of 0xaa v25->v26: virtio-balloon changes only - remove kicking free page vq since the host now polls the vq after initiating the reporting - report_free_page_func: detach all the used buffers afte...

...ner case that the start cmd is overridden by the stop cmd when the host has a delay in reading the start cmd. v27->v28: - mm/page_poison: Move PAGE_POISON to page_poison.c and add a function to expose page poison val to kernel modules. v26->v27: - add a new patch to expose page_poisoning_enabled to kernel modules - virtio-balloon: set poison_val to 0xaaaaaaaa, instead of 0xaa v25->v26: virtio-balloon changes only - remove kicking free page vq since the host now polls the vq after initiating the reporting - report_free_page_func: detach all the used buffers afte...

...ssy migrates between the source and destination. Linux compilation, i.e. make bzImage -j4, is performed during the Ping-Pong migration. The legacy case takes 5min14s to finish the compilation. With this optimization patched, it takes 5min12s. ChangeLog: v26->v27: - add a new patch to expose page_poisoning_enabled to kernel modules - virtio-balloon: set poison_val to 0xaaaaaaaa, instead of 0xaa v25->v26: virtio-balloon changes only - remove kicking free page vq since the host now polls the vq after initiating the reporting - report_free_page_func: detach all the used buffers afte...

...at 02:38:45PM +0800, Wei Wang wrote: > On 12/01/2017 11:49 PM, Michael S. Tsirkin wrote: > > On Wed, Nov 29, 2017 at 09:55:26PM +0800, Wei Wang wrote: > > > The guest free pages should not be discarded by the live migration thread > > > when page poisoning is enabled with PAGE_POISONING_NO_SANITY=n, because > > > skipping the transfer of such poisoned free pages will trigger false > > > positive when new pages are allocated and checked on the destination. > > > This patch skips the reporting of free pages in the above case. > > > > > >...

...at 02:38:45PM +0800, Wei Wang wrote: > On 12/01/2017 11:49 PM, Michael S. Tsirkin wrote: > > On Wed, Nov 29, 2017 at 09:55:26PM +0800, Wei Wang wrote: > > > The guest free pages should not be discarded by the live migration thread > > > when page poisoning is enabled with PAGE_POISONING_NO_SANITY=n, because > > > skipping the transfer of such poisoned free pages will trigger false > > > positive when new pages are allocated and checked on the destination. > > > This patch skips the reporting of free pages in the above case. > > > > > >...

...Cc: Michal Hocko <mhocko at kernel.org> --- drivers/virtio/virtio_balloon.c | 255 +++++++++++++++++++++++++++++++----- include/uapi/linux/virtio_balloon.h | 7 + mm/page_poison.c | 6 + 3 files changed, 232 insertions(+), 36 deletions(-) Resend Change: - Expose page_poisoning_enabled to kernel modules diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index a1fb52c..5476725 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -51,9 +51,22 @@ MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); stat...

...Cc: Michal Hocko <mhocko at kernel.org> --- drivers/virtio/virtio_balloon.c | 255 +++++++++++++++++++++++++++++++----- include/uapi/linux/virtio_balloon.h | 7 + mm/page_poison.c | 6 + 3 files changed, 232 insertions(+), 36 deletions(-) Resend Change: - Expose page_poisoning_enabled to kernel modules diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index a1fb52c..5476725 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -51,9 +51,22 @@ MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); stat...

On Wed, Nov 29, 2017 at 09:55:26PM +0800, Wei Wang wrote: > The guest free pages should not be discarded by the live migration thread > when page poisoning is enabled with PAGE_POISONING_NO_SANITY=n, because > skipping the transfer of such poisoned free pages will trigger false > positive when new pages are allocated and checked on the destination. > This patch skips the reporting of free pages in the above case. > > Reported-by: Michael S. Tsirkin <mst at redhat...

On Wed, Nov 29, 2017 at 09:55:26PM +0800, Wei Wang wrote: > The guest free pages should not be discarded by the live migration thread > when page poisoning is enabled with PAGE_POISONING_NO_SANITY=n, because > skipping the transfer of such poisoned free pages will trigger false > positive when new pages are allocated and checked on the destination. > This patch skips the reporting of free pages in the above case. > > Reported-by: Michael S. Tsirkin <mst at redhat...

...rg> > --- > drivers/virtio/virtio_balloon.c | 255 +++++++++++++++++++++++++++++++----- > include/uapi/linux/virtio_balloon.h | 7 + > mm/page_poison.c | 6 + > 3 files changed, 232 insertions(+), 36 deletions(-) > > Resend Change: > - Expose page_poisoning_enabled to kernel modules RESEND tag is for reposting unchanged patches. you want to post a v27, and you want the mm patch as a separate one, so you can get an ack on it from someone on linux-mm. In fact, I would probably add reporting the poison value as a separate feature/couple of patches. &g...