search for: map

Serve an arbitrary map of regions of the underlying plugin. --- common-rules.mk | 1 + configure.ac | 1 + filters/map/Makefile.am | 61 +++ filters/map/map.c | 256 +++++++++ filters/map/maptype.c...

...ry not use RCU to syncrhonize MMU notifier with vhost worker - set dirty pages after no readers - return -EAGAIN only when we find the range is overlapped with metadata Jason Wang (9): vhost: don't set uaddr for invalid address vhost: validate MMU notifier registration vhost: fix vhost map leak vhost: reset invalidate_count in vhost_set_vring_num_addr() vhost: mark dirty pages during map uninit vhost: don't do synchronize_rcu() in vhost_uninit_vq_maps() vhost: do not use RCU to synchronize MMU notifier with worker vhost: correctly set dirty pages in MMU notifiers callba...

...r with worker. This leads calling synchronize_rcu() in invalidate_range_start(). But on a busy system, there would be many factors that may slow down the synchronize_rcu() which makes it unsuitable to be called in MMU notifier. So this patch switches use seqlock counter to track whether or not the map was used. The counter was increased when vq try to start or finish uses the map. This means, when it was even, we're sure there's no readers and MMU notifier is synchronized. When it was odd, it means there's a reader we need to wait it to be even again then we are synchronized. Conside...

...> provide a synchronization method between readers and writers. The last > choice is to use vq mutex, but it need to deal with the worst case > that MMU notifier must be blocked and wait for the finish of swap in. > > So this patch switches use a counter to track whether or not the map > was used. The counter was increased when vq try to start or finish > uses the map. This means, when it was even, we're sure there's no > readers and MMU notifier is synchronized. When it was odd, it means > there's a reader we need to wait it to be even again then we are &...

...> provide a synchronization method between readers and writers. The last > choice is to use vq mutex, but it need to deal with the worst case > that MMU notifier must be blocked and wait for the finish of swap in. > > So this patch switches use a counter to track whether or not the map > was used. The counter was increased when vq try to start or finish > uses the map. This means, when it was even, we're sure there's no > readers and MMU notifier is synchronized. When it was odd, it means > there's a reader we need to wait it to be even again then we are &...

...qlock, but it doesn't provide a synchronization method between readers and writers. The last choice is to use vq mutex, but it need to deal with the worst case that MMU notifier must be blocked and wait for the finish of swap in. So this patch switches use a counter to track whether or not the map was used. The counter was increased when vq try to start or finish uses the map. This means, when it was even, we're sure there's no readers and MMU notifier is synchronized. When it was odd, it means there's a reader we need to wait it to be even again then we are synchronized. To avoi...

I want to overlay a small inset map on top of another map, but I can't figure out how to do it. For example, here are two different maps: # map 1 - Ohio map("state", region= "ohio") # map 2 - US with Ohio darkened map("state") map("state", region="ohio", fill=T, add=T) I woul...

Am 29.09.20 um 17:14 schrieb Thomas Zimmermann: > The new helper ttm_kmap_obj_to_dma_buf() extracts address and location > from and instance of TTM's kmap_obj and initializes struct dma_buf_map > with these values. Helpful for TTM-based drivers. We could completely drop that if we use the same structure inside TTM as well. Additional to that which driver is...

Am 29.09.20 um 17:14 schrieb Thomas Zimmermann: > The new helper ttm_kmap_obj_to_dma_buf() extracts address and location > from and instance of TTM's kmap_obj and initializes struct dma_buf_map > with these values. Helpful for TTM-based drivers. We could completely drop that if we use the same structure inside TTM as well. Additional to that which driver is...

Am 29.09.20 um 17:14 schrieb Thomas Zimmermann: > The new helper ttm_kmap_obj_to_dma_buf() extracts address and location > from and instance of TTM's kmap_obj and initializes struct dma_buf_map > with these values. Helpful for TTM-based drivers. We could completely drop that if we use the same structure inside TTM as well. Additional to that which driver is...

On Tue, Jul 23, 2019 at 03:57:17AM -0400, Jason Wang wrote: > We don't mark dirty pages if the map was teared down outside MMU > notifier. This will lead untracked dirty pages. Fixing by marking > dirty pages during map uninit. > > Reported-by: Michael S. Tsirkin <mst at redhat.com> > Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual address")...

On Tue, Jul 23, 2019 at 03:57:17AM -0400, Jason Wang wrote: > We don't mark dirty pages if the map was teared down outside MMU > notifier. This will lead untracked dirty pages. Fixing by marking > dirty pages during map uninit. > > Reported-by: Michael S. Tsirkin <mst at redhat.com> > Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual address")...

...hod between readers and writers. The last > >> choice is to use vq mutex, but it need to deal with the worst case > >> that MMU notifier must be blocked and wait for the finish of swap in. > >> > >> So this patch switches use a counter to track whether or not the map > >> was used. The counter was increased when vq try to start or finish > >> uses the map. This means, when it was even, we're sure there's no > >> readers and MMU notifier is synchronized. When it was odd, it means > >> there's a reader we need to wa...

...(-) > > diff --git a/drivers/xen/gntdev-common.h b/drivers/xen/gntdev-common.h > index 2f8b949c3eeb14..b201fdd20b667b 100644 > --- a/drivers/xen/gntdev-common.h > +++ b/drivers/xen/gntdev-common.h > @@ -21,15 +21,8 @@ struct gntdev_dmabuf_priv; > struct gntdev_priv { > /* Maps with visible offsets in the file descriptor. */ > struct list_head maps; > - /* > - * Maps that are not visible; will be freed on munmap. > - * Only populated if populate_freeable_maps == 1 > - */ > - struct list_head freeable_maps; > /* lock protects maps and freeable_...

Am 15.10.20 um 14:38 schrieb Thomas Zimmermann: > The new functions ttm_bo_{vmap,vunmap}() map and unmap a TTM BO in kernel > address space. The mapping's address is returned as struct dma_buf_map. > Each function is a simplified version of TTM's existing kmap code. Both > functions respect the memory's location ani/or writecombine flags. > > On top T...

...ry not use RCU to syncrhonize MMU notifier with vhost worker - set dirty pages after no readers - return -EAGAIN only when we find the range is overlapped with metadata Jason Wang (9): vhost: don't set uaddr for invalid address vhost: validate MMU notifier registration vhost: fix vhost map leak vhost: reset invalidate_count in vhost_set_vring_num_addr() vhost: mark dirty pages during map uninit vhost: don't do synchronize_rcu() in vhost_uninit_vq_maps() vhost: do not use RCU to synchronize MMU notifier with worker vhost: correctly set dirty pages in MMU notifiers callba...

...ry not use RCU to syncrhonize MMU notifier with vhost worker - set dirty pages after no readers - return -EAGAIN only when we find the range is overlapped with metadata Jason Wang (9): vhost: don't set uaddr for invalid address vhost: validate MMU notifier registration vhost: fix vhost map leak vhost: reset invalidate_count in vhost_set_vring_num_addr() vhost: mark dirty pages during map uninit vhost: don't do synchronize_rcu() in vhost_uninit_vq_maps() vhost: do not use RCU to synchronize MMU notifier with worker vhost: correctly set dirty pages in MMU notifiers callba...

Hi, I would like to plot a map of US counties using different colors. map() seems to be the function to use, e.g. library(maps); map('usa'); map('county', 'colorado', add=T,fill = T, col=c(1:5)) plots Colorado counties using colours 1 to 5. However, I want each color to represent a certain value - a va...

...round-up=512 This will serve a virtual device with size 512 bytes. Reading from the last 12 bytes will return zeroes. And writing is permitted, provided you only write zeroes. An alternative might have been to extend the offset filter to deal with this, but that could have got quite clumsy. * map: This is an all-purpose remapping filter. Best to read the man page to see what this does. (These filters are not really related to each other, except that the truncate filter turned out to be necessary to test the map filter.) Rich.

...ry not use RCU to syncrhonize MMU notifier with vhost worker - set dirty pages after no readers - return -EAGAIN only when we find the range is overlapped with metadata Jason Wang (9): vhost: don't set uaddr for invalid address vhost: validate MMU notifier registration vhost: fix vhost map leak vhost: reset invalidate_count in vhost_set_vring_num_addr() vhost: mark dirty pages during map uninit vhost: don't do synchronize_rcu() in vhost_uninit_vq_maps() vhost: do not use RCU to synchronize MMU notifier with worker vhost: correctly set dirty pages in MMU notifiers callba...