Re: [PATCH] tty: hvc: don't allocate a buffer for console print on stack

On Fri, Feb 17, 2017 at 11:42:45PM +0300, Jan Dakinevich wrote: > The buffer is used by virtio console driver as DMA buffer. Since v4.9 > (if VMAP_STACK is enabled) we shouldn't use the stack for DMA. You shouldn't use 'static' data either, that's not always guaranteed to be DMA-able, right? >

Re: [PATCH kernel v8 4/4] virtio-balloon: VIRTIO_BALLOON_F_HOST_REQ_VQ

On Thu, Mar 16, 2017 at 03:08:47PM +0800, Wei Wang wrote: > From: Liang Li > > Add a new vq, host request vq. The host uses the vq to send > requests to the guest. Upon getting a request, the guest responds > what the host needs via this vq. > > The patch implements the

Re: [PATCH kernel v8 3/4] mm: add inerface to offer info about unused pages

On Thu, Mar 16, 2017 at 03:08:46PM +0800, Wei Wang wrote: > +/* > + * The record_unused_pages() function is used to record the system unused > + * pages. The unused pages can be skipped to transfer during live migration. > + * Though the unused pages are dynamically changing, dirty page logging >

Re: [PATCH kernel v8 3/4] mm: add inerface to offer info about unused pages

On Thu, 16 Mar 2017 15:08:46 +0800 Wei Wang wrote: > From: Liang Li > > This patch adds a function to provides a snapshot of the present system > unused pages. An important usage of this function is to provide the > unsused pages to the Live

Re: [PATCH-v5 0/4] vsock: cancel connect packets when failing to connect

On Wed, Mar 15, 2017 at 09:32:13AM +0800, Peng Tao wrote: > Currently, if a connect call fails on a signal or timeout (e.g., guest is > still > in the process of starting up), we'll just return to caller and leave the > connect > packet queued and they are sent even though the connection is

[PATCH kernel v8 4/4] virtio-balloon: VIRTIO_BALLOON_F_HOST_REQ_VQ

From: Liang Li Add a new vq, host request vq. The host uses the vq to send requests to the guest. Upon getting a request, the guest responds what the host needs via this vq. The patch implements the request of getting the unsed pages from the guest. The unused guest pages

[PATCH kernel v8 3/4] mm: add inerface to offer info about unused pages

From: Liang Li This patch adds a function to provides a snapshot of the present system unused pages. An important usage of this function is to provide the unsused pages to the Live migration thread, which skips the transfer of thoses unused pages. Newly used pages can be

[PATCH kernel v8 2/4] virtio-balloon: VIRTIO_BALLOON_F_CHUNK_TRANSFER

From: Liang Li The implementation of the current virtio-balloon is not very efficient, because the ballooned pages are transferred to the host one by one. Here is the breakdown of the time in percentage spent on each step of the balloon inflating process (inflating 7GB of

[PATCH kernel v8 1/4] virtio-balloon: deflate via a page list

From: Liang Li This patch saves the deflated pages to a list, instead of the PFN array. Accordingly, the balloon_pfn_to_page() function is removed. Signed-off-by: Liang Li Signed-off-by: Michael S. Tsirkin Signed-off-by: Wei Wang

[PATCH kernel v8 0/4] Extend virtio-balloon for fast (de)inflating & fast live migration

This patch series implements two optimizations: 1) transfer pages in chuncks between the guest and host; 2) transfer the guest unused pages to the host so that they can be skipped to migrate in live migration. Please read each patch commit log for details. Changes: v7->v8: 1) Use only one chunk