Re: [PATCH] do not call trace_printk on non-debug build

ost...@goodmis.org> wrote: > On Tue, 24 Apr 2018 16:45:05 -0400 > Steven Rostedt <rost...@goodmis.org> wrote: > > On Tue, 24 Apr 2018 20:39:27 + > > Wei Wang <w...@google.com> wrote: > > > > > The config is not something new and it is controlling pr_deb

Re: [PATCH] do not call trace_printk on non-debug build

: > On Tue, 24 Apr 2018 16:45:05 -0400 > Steven Rostedt wrote: > > On Tue, 24 Apr 2018 20:39:27 +0000 > > Wei Wang wrote: > > > > > The config is not something new and it is controlling pr_debug and > > > pr_devel, so might not be too annoying, IMHO. But I

[PATCH] kernel.h: fix a typo in comment

From: Wei Wang <w...@google.com> Signed-off-by: Wei Wang <w...@google.com> --- include/linux/kernel.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 6a1eb0b0aad96..e37e40ff14bba 100644 --- a/include/linux/ke

[PATCH] kernel.h: fix a typo in comment

From: Wei Wang Signed-off-by: Wei Wang --- include/linux/kernel.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 6a1eb0b0aad96..e37e40ff14bba 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -664,7

Re: [PATCH] do not call trace_printk on non-debug build

On Tue, Apr 24, 2018, 12:26 Steven Rostedt <rost...@goodmis.org> wrote: > On Tue, 24 Apr 2018 19:20:03 +0000 > Wei Wang <w...@google.com> wrote: > > checkpatch.pl sounds good. One thing to add is we have many off tree > > patches with abuse trace_printk

Re: [PATCH] do not call trace_printk on non-debug build

On Tue, Apr 24, 2018, 12:26 Steven Rostedt wrote: > On Tue, 24 Apr 2018 19:20:03 + > Wei Wang wrote: > > checkpatch.pl sounds good. One thing to add is we have many off tree > > patches with abuse trace_printk. Also as you mentioned, given this is > > really n

Re: [PATCH] do not call trace_printk on non-debug build

, Apr 24, 2018 at 12:14 PM Steven Rostedt <rost...@goodmis.org> wrote: > On Tue, 24 Apr 2018 19:02:34 +0000 > Wei Wang <w...@google.com> wrote: > > We have seen many cases vendor have shipped kernel/drivers with it, and > > have to clean up that every year. This

Re: [PATCH] do not call trace_printk on non-debug build

, Apr 24, 2018 at 12:14 PM Steven Rostedt wrote: > On Tue, 24 Apr 2018 19:02:34 + > Wei Wang wrote: > > We have seen many cases vendor have shipped kernel/drivers with it, and > > have to clean up that every year. This was brought up in an internal > > discussion and

Re: [PATCH] do not call trace_printk on non-debug build

him "I think this change makes sense at a high level, but there could be non-obvious reasons why this isn't the way things are handled right now." On Tue, Apr 24, 2018 at 11:51 AM Steven Rostedt <rost...@goodmis.org> wrote: > On Tue, 24 Apr 2018 11:08:10 -0700 > Wei Wang &

Re: [PATCH] do not call trace_printk on non-debug build

him "I think this change makes sense at a high level, but there could be non-obvious reasons why this isn't the way things are handled right now." On Tue, Apr 24, 2018 at 11:51 AM Steven Rostedt wrote: > On Tue, 24 Apr 2018 11:08:10 -0700 > Wei Wang wrote: > > From: Wei Wang

[PATCH] do not call trace_printk on non-debug build

From: Wei Wang <w...@google.com> trace_printk will cause trace_printk_init_buffers executed in kernel start, which will increase memory and also show bad warnings in production kernel. Signed-off-by: Wei Wang <w...@google.com> --- include/linux/kernel.h | 17 ++

[PATCH] do not call trace_printk on non-debug build

From: Wei Wang trace_printk will cause trace_printk_init_buffers executed in kernel start, which will increase memory and also show bad warnings in production kernel. Signed-off-by: Wei Wang --- include/linux/kernel.h | 17 + include/linux/trace_events.h | 4 2

Re: [PATCH v29 1/4] mm: support reporting free page blocks

On 04/11/2018 07:25 AM, Michael S. Tsirkin wrote: On Tue, Apr 10, 2018 at 01:54:29PM -0700, Andrew Morton wrote: On Tue, 10 Apr 2018 21:19:31 +0300 "Michael S. Tsirkin" wrote: Andrew, were your questions answered? If yes could I bother you for an ack on this? Still not

Re: [PATCH v29 1/4] mm: support reporting free page blocks

On 04/11/2018 07:25 AM, Michael S. Tsirkin wrote: On Tue, Apr 10, 2018 at 01:54:29PM -0700, Andrew Morton wrote: On Tue, 10 Apr 2018 21:19:31 +0300 "Michael S. Tsirkin" wrote: Andrew, were your questions answered? If yes could I bother you for an ack on this? Still not very happy that

[PATCH v32 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Sign

[PATCH v32 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michael S

[PATCH v32 0/4] Virtio-balloon: support free page reporting

stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https://lwn.net/Articles/743660/ Wei Wang (4): mm: suppo

[PATCH v32 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Suggested-by: Michael S. Tsirkin <m...@r

[PATCH v32 0/4] Virtio-balloon: support free page reporting

stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https://lwn.net/Articles/743660/ Wei Wang (4): mm: suppo

[PATCH v32 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang Suggested-by: Michael S. Tsirkin Cc: Michael S. Tsirkin Cc: Michal

[PATCH v32 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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.w...@intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Micha

[PATCH v32 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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 Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin Acked-by: Andrew Morton --- mm

[PATCH v32 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Signed-off-by: Liang Li <liang.z...@intel.com> Cc: Michal Hocko <mho...@kernel.org&

[PATCH v32 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michal Hocko Cc: Andrew Morton Cc: Michael S. Tsirkin Acked-by: Michal Hocko --- include/li

Re: [PATCH v31 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

On 04/09/2018 02:03 PM, Michael S. Tsirkin wrote: On Fri, Apr 06, 2018 at 08:17:23PM +0800, Wei Wang wrote: Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free

Re: [PATCH v31 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

On 04/09/2018 02:03 PM, Michael S. Tsirkin wrote: On Fri, Apr 06, 2018 at 08:17:23PM +0800, Wei Wang wrote: Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free

[PATCH v31 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Signed-off-by: Liang Li <liang.z...@intel.com> Cc: Michal Hocko <mho...@kernel.org&

[PATCH v31 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Suggested-by: Michael S. Tsirkin <m...@r

[PATCH v31 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michal Hocko Cc: Andrew Morton Cc: Michael S. Tsirkin Acked-by: Michal Hocko --- include/li

[PATCH v31 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang Suggested-by: Michael S. Tsirkin Cc: Michael S. Tsirkin Cc: Michal

[PATCH v31 0/4] Virtio-balloon: support free page reporting

ss this flag check later; - init_vqs: change to put some variables on stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, plea

[PATCH v31 0/4] Virtio-balloon: support free page reporting

ss this flag check later; - init_vqs: change to put some variables on stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, plea

[PATCH v31 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Sign

[PATCH v31 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michael S

[PATCH v31 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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.w...@intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Micha

[PATCH v31 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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 Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin Acked-by: Andrew Morton --- mm

Re: [PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

On 04/04/2018 02:47 AM, Michael S. Tsirkin wrote: On Wed, Apr 04, 2018 at 12:10:03AM +0800, Wei Wang wrote: +static int add_one_sg(struct virtqueue *vq, unsigned long pfn, uint32_t len) +{ + struct scatterlist sg; + unsigned int unused; + + sg_init_table(, 1

Re: [PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

On 04/04/2018 02:47 AM, Michael S. Tsirkin wrote: On Wed, Apr 04, 2018 at 12:10:03AM +0800, Wei Wang wrote: +static int add_one_sg(struct virtqueue *vq, unsigned long pfn, uint32_t len) +{ + struct scatterlist sg; + unsigned int unused; + + sg_init_table(, 1

[PATCH v30 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Signed-off-by: Liang Li <liang.z...@intel.com> Cc: Michal Hocko <mho...@kernel.org&

[PATCH v30 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michal Hocko Cc: Andrew Morton Cc: Michael S. Tsirkin Acked-by: Michal Hocko --- include/li

[PATCH v30 0/4] Virtio-balloon: support free page reporting

t_vqs: change to put some variables on stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https:/

[PATCH v30 0/4] Virtio-balloon: support free page reporting

t_vqs: change to put some variables on stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https:/

[PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Sign

[PATCH v30 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Suggested-by: Michael S. Tsirkin <m...@r

[PATCH v30 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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.w...@intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Micha

[PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michael S

[PATCH v30 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang Suggested-by: Michael S. Tsirkin Cc: Michael S. Tsirkin Cc: Michal

[PATCH v30 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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 Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin Acked-by: Andrew Morton --- mm

Re: [PATCH v29 1/4] mm: support reporting free page blocks

On 03/27/2018 05:22 AM, Andrew Morton wrote: On Mon, 26 Mar 2018 10:39:51 +0800 Wei Wang <wei.w.w...@intel.com> wrote: This patch adds support to walk through the free page blocks in the system and report them via a callback function. Some page blocks may leave the free list after zone

Re: [PATCH v29 1/4] mm: support reporting free page blocks

On 03/27/2018 05:22 AM, Andrew Morton wrote: On Mon, 26 Mar 2018 10:39:51 +0800 Wei Wang wrote: This patch adds support to walk through the free page blocks in the system and report them via a callback function. Some page blocks may leave the free list after zone->lock is released,

[PATCH v29 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Suggested-by: Michael S. Tsirkin <m...@r

[PATCH v29 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang Suggested-by: Michael S. Tsirkin Cc: Michael S. Tsirkin Cc: Michal

[PATCH v29 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Signed-off-by: Liang Li <liang.z...@intel.com> Cc: Michal Hocko <mho...@kernel.org> C

[PATCH v29 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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.w...@intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Micha

[PATCH v29 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michal Hocko Cc: Michael S. Tsirkin Acked-by: Michal Hocko --- include/linux/mm.h | 6

[PATCH v29 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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 Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin --- mm/page_poison.c | 6 ++ 1 file

[PATCH v29 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Sign

[PATCH v29 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michael S

[PATCH v29 0/4] Virtio-balloon: support free page reporting

tion; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https://lwn.net/Articles/743660/ Wei Wang (4): mm: support reporting free page blocks

[PATCH v29 0/4] Virtio-balloon: support free page reporting

tion; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https://lwn.net/Articles/743660/ Wei Wang (4): mm: support reporting free page blocks

Re: [PATCH] mm: add config for readahead window

On Sun, Mar 18, 2018 at 7:37 PM Huang, Ying <ying.hu...@intel.com> wrote: > Wei Wang <w...@google.com> writes: > > Android devices boot time benefits by bigger readahead window setting from > > init. This patch will make readahead window a config so early boot ca

Re: [PATCH] mm: add config for readahead window

On Sun, Mar 18, 2018 at 7:37 PM Huang, Ying wrote: > Wei Wang writes: > > Android devices boot time benefits by bigger readahead window setting from > > init. This patch will make readahead window a config so early boot can > > benefit by it as well. > Can you change

Re: [PATCH] mm: add config for readahead window

On Fri, Mar 16, 2018 at 2:59 PM Andrew Morton <a...@linux-foundation.org> wrote: > On Fri, 16 Mar 2018 21:51:48 + Wei Wang <wei.vince.w...@gmail.com> wrote: > > On Fri, Mar 16, 2018, 14:33 Andrew Morton <a...@linux-foundation.org> wrote: > > > > > O

Re: [PATCH] mm: add config for readahead window

On Fri, Mar 16, 2018 at 2:59 PM Andrew Morton wrote: > On Fri, 16 Mar 2018 21:51:48 +0000 Wei Wang wrote: > > On Fri, Mar 16, 2018, 14:33 Andrew Morton wrote: > > > > > On Fri, 16 Mar 2018 11:25:08 -0700 Wei Wang wrote: > > > > > > > Change

[PATCH] mm: add config for readahead window

From: Wei Wang <w...@google.com> Change VM_MAX_READAHEAD value from the default 128KB to a configurable value. This will allow the readahead window to grow to a maximum size bigger than 128KB during boot, which could benefit to sequential read throughput and thus boot performance. Sign

[PATCH] mm: add config for readahead window

From: Wei Wang Change VM_MAX_READAHEAD value from the default 128KB to a configurable value. This will allow the readahead window to grow to a maximum size bigger than 128KB during boot, which could benefit to sequential read throughput and thus boot performance. Signed-off-by: Wei Wang

Re: [PATCH] mm/page_poison: move PAGE_POISON to page_poison.c

On 02/13/2018 06:16 PM, Michal Hocko wrote: 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 w

Re: [PATCH] mm/page_poison: move PAGE_POISON to page_poison.c

On 02/13/2018 06:16 PM, Michal Hocko wrote: 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 w

Re: [PATCH v28 0/4] Virtio-balloon: support free page reporting

On 02/09/2018 11:14 AM, Michael S. Tsirkin wrote: On Fri, Feb 09, 2018 at 11:11:39AM +0800, Wei Wang wrote: On 02/09/2018 03:55 AM, Michael S. Tsirkin wrote: On Thu, Feb 08, 2018 at 05:50:16PM +0800, Wei Wang wrote: Details: Set up a Ping-Pong local live migration, where the guest ceaselessy

Re: [PATCH v28 0/4] Virtio-balloon: support free page reporting

On 02/09/2018 11:14 AM, Michael S. Tsirkin wrote: On Fri, Feb 09, 2018 at 11:11:39AM +0800, Wei Wang wrote: On 02/09/2018 03:55 AM, Michael S. Tsirkin wrote: On Thu, Feb 08, 2018 at 05:50:16PM +0800, Wei Wang wrote: Details: Set up a Ping-Pong local live migration, where the guest ceaselessy

[PATCH] mm/page_poison: move PAGE_POISON to page_poison.c

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.w...@intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Michal Hocko <mho...@

[PATCH] mm/page_poison: move PAGE_POISON to page_poison.c

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 Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin --- include/linux/poison.h | 7 --- mm/pag

Re: [PATCH v28 0/4] Virtio-balloon: support free page reporting

On 02/09/2018 03:55 AM, Michael S. Tsirkin wrote: On Thu, Feb 08, 2018 at 05:50:16PM +0800, Wei Wang wrote: Details: Set up a Ping-Pong local live migration, where the guest ceaselessy migrates between the source and destination. Linux compilation, i.e. make bzImage -j4, is performed during

Re: [PATCH v28 0/4] Virtio-balloon: support free page reporting

On 02/09/2018 03:55 AM, Michael S. Tsirkin wrote: On Thu, Feb 08, 2018 at 05:50:16PM +0800, Wei Wang wrote: Details: Set up a Ping-Pong local live migration, where the guest ceaselessy migrates between the source and destination. Linux compilation, i.e. make bzImage -j4, is performed during

[PATCH v28 3/4] mm/page_poison: add a function to expose page poison val to kernel modules

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

[PATCH v28 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Suggested-by: Michael S. Tsirkin <m...@r

[PATCH v28 3/4] mm/page_poison: add a function to expose page poison val to kernel modules

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 Cc

[PATCH v28 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang Suggested-by: Michael S. Tsirkin Cc: Michael S. Tsirkin Cc: Michal

[PATCH v28 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Sign

[PATCH v28 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michael S

[PATCH v28 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Signed-off-by: Liang Li <liang.z...@intel.com> Cc: Michal Hocko <mho...@kernel.org> C

[PATCH v28 0/4] Virtio-balloon: support free page reporting

t;balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https://lwn.net/Articles/743660/ Wei Wang (4): mm: support reporting free page blocks virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT mm/p

[PATCH v28 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michal Hocko Cc: Michael S. Tsirkin Acked-by: Michal Hocko --- include/linux/mm.h | 6

[PATCH v28 0/4] Virtio-balloon: support free page reporting

t;balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog, please reference https://lwn.net/Articles/743660/ Wei Wang (4): mm: support reporting free page blocks virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT mm/p

Re: [PATCH v27 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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

Re: [PATCH v27 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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

Re: [PATCH v26 2/2 RESEND] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

On 02/07/2018 12:34 PM, Michael S. Tsirkin wrote: On Wed, Feb 07, 2018 at 11:01:06AM +0800, Wei Wang wrote: Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free

Re: [PATCH v26 2/2 RESEND] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

On 02/07/2018 12:34 PM, Michael S. Tsirkin wrote: On Wed, Feb 07, 2018 at 11:01:06AM +0800, Wei Wang wrote: Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free

[PATCH v27 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Sign

[PATCH v27 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michael S

[PATCH v27 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Suggested-by: Michael S. Tsirkin <m...@r

[PATCH v27 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang Suggested-by: Michael S. Tsirkin Cc: Michael S. Tsirkin Cc: Michal

[PATCH v27 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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.w...@intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Micha

[PATCH v27 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules

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 Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin --- mm/page_poison.c | 6 ++ 1 file

[PATCH v27 0/4] Virtio-balloon: support free page reporting

iscuss this flag check later; - init_vqs: change to put some variables on stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog

[PATCH v27 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Signed-off-by: Liang Li <liang.z...@intel.com> Cc: Michal Hocko <mho...@kernel.org> C

[PATCH v27 0/4] Virtio-balloon: support free page reporting

iscuss this flag check later; - init_vqs: change to put some variables on stack to have simpler implementation; - add destroy_workqueue(vb->balloon_wq); v21->v22: - add_one_sg: some code and comment re-arrangement - send_cmd_id: handle a cornercase For previous ChangeLog

[PATCH v27 1/4] mm: support reporting free page blocks

ges but are written after the report function returns will be captured by the hypervisor, and they will be added to the next round of memory transfer. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michal Hocko Cc: Michael S. Tsirkin Acked-by: Michal Hocko --- include/linux/mm.h | 6

[PATCH v26 2/2 RESEND] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang <wei.w.w...@intel.com> Sign

[PATCH v26 2/2 RESEND] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

sending the starting cmd id, so the guest doesn't need to kick after filling an element to the vq. Host may also requests the guest to stop the reporting in advance by sending the stop cmd id to the guest via the configuration register. Signed-off-by: Wei Wang Signed-off-by: Liang Li Cc: Michael S

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