search for: page_poison

The PAGE_POISON macro is used in page_poison.c only, so avoid exporting it. Also remove the "mm/debug-pagealloc.c" related comment, which is obsolete. 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&...

The PAGE_POISON macro is used in page_poison.c only, so avoid exporting it. Also remove the "mm/debug-pagealloc.c" related comment, which is obsolete. 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&...

On Fri 09-02-18 16:08:14, Wei Wang wrote: > The PAGE_POISON macro is used in page_poison.c only, so avoid exporting > it. Also remove the "mm/debug-pagealloc.c" related comment, which is > obsolete. Why is this an improvement? I thought the whole point of poison.h is to keep all the poison value at a single place to make them obviously uniq...

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_...

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_...

Move the PAGE_POISON value to page_poison.c and add a function to enable callers from a kernel module to get the poison value if the page poisoning feature is in use. This also avoids callers directly checking PAGE_POISON regardless of whether the feature is enabled. Signed-off-by: Wei Wang <wei.w.wang at intel.com...

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>...

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 i...

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 i...

...where the guest ceaselessy 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: 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...

...where the guest ceaselessy 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: 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...

...make bzImage -j4): - Live Migration Time (average) Optimization v.s. Legacy = 1260ms v.s. 2634ms --> ~51% reduction - Linux Compilation Time Optimization v.s. Legacy = 4min58s v.s. 5min3s --> no obvious difference ChangeLog: v28->v29: - mm/page_poison: only expose page_poison_enabled(), rather than more changes did in v28, as we are not 100% confident about that for now. - virtio-balloon: use a separate buffer for the stop cmd, instead of having the start and stop cmd use the same buffer. This avoids the corner case that th...

...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 a...

...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. > > > > > &...

...t intel.com> Signed-off-by: Liang Li <liang.z.li at intel.com> Cc: Michael S. Tsirkin <mst at redhat.com> 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 ++...

...t intel.com> Signed-off-by: Liang Li <liang.z.li at intel.com> Cc: Michael S. Tsirkin <mst at redhat.com> 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 ++...

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 red...

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 red...

...Liang Li <liang.z.li at intel.com> > Cc: Michael S. Tsirkin <mst at redhat.com> > 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 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 ge...