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...lation time by 8.6x. >> But more importantly, if we hadn't killed the "grep balloon >> /proc/vmstat" process then, without the patch, the inflation process >> would never reach the target. >> >> [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html >> >> Reported-by: Tyler Sanderson <tysand at google.com> >> Tested-by: Tyler Sanderson <tysand at google.com> >> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") >> Cc: Michael S. Tsirkin <mst at redhat.com> &...

...lation time by 8.6x. >> But more importantly, if we hadn't killed the "grep balloon >> /proc/vmstat" process then, without the patch, the inflation process >> would never reach the target. >> >> [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html >> >> Reported-by: Tyler Sanderson <tysand at google.com> >> Tested-by: Tyler Sanderson <tysand at google.com> >> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") >> Cc: Michael S. Tsirkin <mst at redhat.com> &...

...ate/deflate activity by 12x, and reduced inflation time by 8.6x. But more importantly, if we hadn't killed the "grep balloon /proc/vmstat" process then, without the patch, the inflation process would never reach the target. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Reported-by: Tyler Sanderson <tysand at google.com> Tested-by: Tyler Sanderson <tysand at google.com> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Wei Wang <wei.w.wang at intel.com>...

...ate/deflate activity by 12x, and reduced inflation time by 8.6x. But more importantly, if we hadn't killed the "grep balloon /proc/vmstat" process then, without the patch, the inflation process would never reach the target. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Reported-by: Tyler Sanderson <tysand at google.com> Tested-by: Tyler Sanderson <tysand at google.com> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Wei Wang <wei.w.wang at intel.com>...

...flation requests to our hypervisor, > making the OOM path *very* simple. Besically freeing pages and > updating the balloon. If the communication with the host ever > becomes a problem on this call path. > > [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html > > Reported-by: Tyler Sanderson <tysand at google.com> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Wei Wang <wei.w.wang at intel.com> > Cc: Alexander Duyck <alexander.h.duyck at linux.intel.com> > Cc: David Rientjes <rientjes at google.com&...

...ssion under [1]. I tested with QEMU and "deflate-on-oom=on". Works as expected. Did not test the shrinker for VIRTIO_BALLOON_F_FREE_PAGE_HINT, as it is hard to trigger (only when migrating a VM, and even then, it might not trigger). [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html David Hildenbrand (3): virtio-balloon: Fix memory leak when unloading while hinting is in progress virtio_balloon: Fix memory leaks on errors in virtballoon_probe() virtio-balloon: Switch back to OOM handler for VIRTIO_BALLOON_F_DEFLATE_ON_OOM drivers/virtio/virtio_balloon.c |...

...eflation requests to our hypervisor, > making the OOM path *very* simple. Besically freeing pages and > updating the balloon. If the communication with the host ever > becomes a problem on this call path. > > [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html > > Reported-by: Tyler Sanderson <tysand at google.com> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Wei Wang <wei.w.wang at intel.com> > Cc: Alexander Duyck <alexander.h.duyck at linux.intel.com> > Cc: David Rientjes <rientjes at google.com&g...

...eflation requests to our hypervisor, > making the OOM path *very* simple. Besically freeing pages and > updating the balloon. If the communication with the host ever > becomes a problem on this call path. > > [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html > > Reported-by: Tyler Sanderson <tysand at google.com> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Wei Wang <wei.w.wang at intel.com> > Cc: Alexander Duyck <alexander.h.duyck at linux.intel.com> > Cc: David Rientjes <rientjes at google.com&g...

...2x, and reduced inflation time by 8.6x. > But more importantly, if we hadn't killed the "grep balloon > /proc/vmstat" process then, without the patch, the inflation process > would never reach the target. > > [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html > > Reported-by: Tyler Sanderson <tysand at google.com> > Tested-by: Tyler Sanderson <tysand at google.com> > Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Wei Wang &l...

...>> But more importantly, if we hadn't killed the "grep balloon > >> /proc/vmstat" process then, without the patch, the inflation process > >> would never reach the target. > >> > >> [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html > >> > >> Reported-by: Tyler Sanderson <tysand at google.com> > >> Tested-by: Tyler Sanderson <tysand at google.com> > >> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") > >> Cc: Michael S. Tsirkin &l...

@Andrew, as this fix is based on free page reporting, can this go through your tree? Patch #1 contains a proper description. v3 -> v4: - Add Ack from David Rientjes - Minor tweaks to test details in the patch description v2 -> v3: - Use vb->vdev instead of vdev in all feature checks. We'll clean the other ones up later. - Add one empty line virtballoon_probe() to make it look

...ate/deflate activity by 12x, and reduced inflation time by 8.6x. But more importantly, if we hadn't killed the "grep balloon /proc/vmstat" process then, without the patch, the inflation process would never reach the target. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Reported-by: Tyler Sanderson <tysand at google.com> Tested-by: Tyler Sanderson <tysand at google.com> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Wei Wang <wei.w.wang at intel.com>...

...ate/deflate activity by 12x, and reduced inflation time by 8.6x. But more importantly, if we hadn't killed the "grep balloon /proc/vmstat" process then, without the patch, the inflation process would never reach the target. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Reported-by: Tyler Sanderson <tysand at google.com> Tested-by: Tyler Sanderson <tysand at google.com> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Wei Wang <wei.w.wang at intel.com>...

...actually skip sending deflation requests to our hypervisor, making the OOM path *very* simple. Besically freeing pages and updating the balloon. If the communication with the host ever becomes a problem on this call path. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Reported-by: Tyler Sanderson <tysand at google.com> Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Wei Wang <wei.w.wang at intel.com> Cc: Alexander Duyck <alexander.h.duyck at linux.intel.com> Cc: David Rientjes <rientjes at google.com> Cc: Nadav Amit <namit a...

...our hypervisor, >> making the OOM path *very* simple. Besically freeing pages and >> updating the balloon. If the communication with the host ever >> becomes a problem on this call path. >> >> [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html >> >> Reported-by: Tyler Sanderson <tysand at google.com> >> Cc: Michael S. Tsirkin <mst at redhat.com> >> Cc: Wei Wang <wei.w.wang at intel.com> >> Cc: Alexander Duyck <alexander.h.duyck at linux.intel.com> >> Cc: David Rientjes &lt...

...flate/deflate activity by 12x, and reduced inflation time by 8.6x. But more importantly, if we hadn't killed the "cat file > /dev/null" process then, without the patch, the inflation process would never reach the target. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Reported-by: Tyler Sanderson <tysand at google.com> Tested-by: Tyler Sanderson <tysand at google.com> Acked-by: David Rientjes <rientjes at google.com> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") Cc: Michael S. Tsirkin <mst at redh...

...2x, and reduced inflation time by 8.6x. > But more importantly, if we hadn't killed the "grep balloon > /proc/vmstat" process then, without the patch, the inflation process > would never reach the target. > > [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html > > Reported-by: Tyler Sanderson <tysand at google.com> > Tested-by: Tyler Sanderson <tysand at google.com> > Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Wei Wang &l...

...actually skip sending deflation requests to our hypervisor, making the OOM path *very* simple. Besically freeing pages and updating the balloon. If the communication with the host ever becomes a problem on this call path. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Test report by Tyler Sanderson: Test setup: VM with 16 CPU, 64GB RAM. Running Debian 10. We have a 42 GB file full of random bytes that we continually cat to /dev/null. This fills the page cache as the file is read. Meanwhile we trigger the balloon to inflate, with a target size of 53 GB. Th...

...actually skip sending deflation requests to our hypervisor, making the OOM path *very* simple. Besically freeing pages and updating the balloon. If the communication with the host ever becomes a problem on this call path. [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html Test report by Tyler Sanderson: Test setup: VM with 16 CPU, 64GB RAM. Running Debian 10. We have a 42 GB file full of random bytes that we continually cat to /dev/null. This fills the page cache as the file is read. Meanwhile we trigger the balloon to inflate, with a target size of 53 GB. Th...

...+ } +} I don't know whether completely skipping host notifications when !VIRTIO_BALLOON_F_MUST_TELL_HOST will break any hosts. > If the communication with the host ever > becomes a problem on this call path. > > [1] https://www.spinics.net/lists/linux-virtualization/msg40863.html > > Reported-by: Tyler Sanderson <tysand at google.com> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Wei Wang <wei.w.wang at intel.com> > Cc: Alexander Duyck <alexander.h.duyck at linux.intel.com> > Cc: David Rientjes <rientjes at google.com&...