search for: deflation

The idea of the VIRTIO_BALLOON_F_MUST_TELL_HOST feature is to let drivers skip usage of the deflate queue when leaking the balloon ("silent deflation"). Guests may benefit from silent deflate by aggressively inflating the balloon; they know that they will be able to use ballooned pages without issuing a (blocking) request to the device. The problem is that this feature is a "negative" feature: if set, the guest _may not_ use bal...

The idea of the VIRTIO_BALLOON_F_MUST_TELL_HOST feature is to let drivers skip usage of the deflate queue when leaking the balloon ("silent deflation"). Guests may benefit from silent deflate by aggressively inflating the balloon; they know that they will be able to use ballooned pages without issuing a (blocking) request to the device. The problem is that this feature is a "negative" feature: if set, the guest _may not_ use bal...

Here is the series, split in two patches, with small edits and new commit messages. Paolo Bonzini (2): virtio-balloon spec: rewrite description of VIRTIO_BALLOON_F_MUST_TELL_HOST virtio-balloon spec: reintroduce "silent deflation" feature virtio-spec.lyx | 238 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 233 insertions(+), 5 deletions(-) -- 1.8.2.1

The original idea of the VIRTIO_BALLOON_F_MUST_TELL_HOST feature was to let drivers skip usage of the deflate queue when leaking the balloon ("silent deflation"). Guests may benefit from silent deflate by aggressively inflating the balloon; they know that they will be able to use ballooned pages without issuing a (blocking) request to the device. The previous patch redefined the feature to ensure correctness of the operation when drivers do not cor...

On Tue, May 28, 2013 at 07:40:18PM +0200, Paolo Bonzini wrote: > The original idea of the VIRTIO_BALLOON_F_MUST_TELL_HOST feature was to > let drivers skip usage of the deflate queue when leaking the balloon > ("silent deflation"). Guests may benefit from silent deflate by > aggressively inflating the balloon; they know that they will be able to > use ballooned pages without issuing a (blocking) request to the device. > > The previous patch redefined the feature to ensure correctness of the > operatio...

Dear r-devel list members, On a couple of occasions I've encountered the issue illustrated by the following examples: --------- snip ----------- > mod.1 <- lm(Employed ~ GNP.deflator + GNP + Unemployed + + Armed.Forces + Population + Year, data=longley) > mod.2 <- update(mod.1, . ~ . - Year + Year) > all.equal(mod.1, mod.2) [1] TRUE > > f <-

Hello! What is the simplest way to make merb respond to the client sending Accept-Encoding: gzip? Just checking if it exists, otherwise I''ll implement it myself. Regards, Magnus

...nly giving the guest a fake balloon. However, the new feature is about optimization, not correctness. In fact, VIRTIO_BALLOON_F_SILENT_DEFLATE is the optimization feature that VIRTIO_BALLOON_F_MUST_TELL_HOST was meant to be. What I'm interested in, is drivers that can _optionally_ use silent deflation (as an optimization). These should not get a fake balloon! With the new feature bit, these drivers should propose both VIRTIO_BALLOON_F_GUEST_TELLS_HOST and VIRTIO_BALLOON_F_SILENT_DEFLATE. The driver can then use silent deflation if and only if the host has negotiated VIRTIO_BALLOON_F_SILENT_D...

On 05.02.20 17:34, David Hildenbrand wrote: > Commit 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") > changed the behavior when deflation happens automatically. Instead of > deflating when called by the OOM handler, the shrinker is used. > > However, the balloon is not simply some slab cache that should be > shrunk when under memory pressure. The shrinker does not have a concept of > priorities, so this behavior canno...

On 05.02.20 17:34, David Hildenbrand wrote: > Commit 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") > changed the behavior when deflation happens automatically. Instead of > deflating when called by the OOM handler, the shrinker is used. > > However, the balloon is not simply some slab cache that should be > shrunk when under memory pressure. The shrinker does not have a concept of > priorities, so this behavior canno...

Hello dear R help group, I have the following setup to analyse: We have about 150 subjects, and for each subject we performed a pair of tests (under different conditions) 18 times. The 18 different conditions of the test are complementary, in such a way so that if we where to average over the tests (for each subject), we would get no correlation between the tests (between subjects). What we wish

...r, the new feature is about optimization, not correctness. >> In fact, VIRTIO_BALLOON_F_SILENT_DEFLATE is the optimization >> feature that VIRTIO_BALLOON_F_MUST_TELL_HOST was meant to be. >> >> What I'm interested in, is drivers that can _optionally_ use silent >> deflation (as an optimization). These should not get a fake balloon! >> >> With the new feature bit, these drivers should propose both >> VIRTIO_BALLOON_F_GUEST_TELLS_HOST and VIRTIO_BALLOON_F_SILENT_DEFLATE. >> The driver can then use silent deflation if and only if the host >&g...

On Wed 05-02-20 17:34:02, David Hildenbrand wrote: > Commit 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") > changed the behavior when deflation happens automatically. Instead of > deflating when called by the OOM handler, the shrinker is used. > > However, the balloon is not simply some slab cache that should be > shrunk when under memory pressure. The shrinker does not have a concept of > priorities, so this behavior canno...

On Wed 05-02-20 17:34:02, David Hildenbrand wrote: > Commit 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") > changed the behavior when deflation happens automatically. Instead of > deflating when called by the OOM handler, the shrinker is used. > > However, the balloon is not simply some slab cache that should be > shrunk when under memory pressure. The shrinker does not have a concept of > priorities, so this behavior canno...

(this may be a duplicate post since I attached a file to the previous try...sorry about that) Below are the first few lines of a zlib compressed byte array written from Java with the Deflator class. > readBin("row_1",raw(),10000000) [1] 4c 45 50 e2 49 d5 86 bc 48 a1 32 5d 49 9d f5 90 48 e0 14 33 49 8f 54 6a 49 77 c9 48 48 d9 ec 56 47 91 48 f0 47 25 56 ef 47 b8 f5 7b 46 35 25 00

On Fri, Oct 20, 2017 at 07:54:25PM +0800, Wei Wang wrote: > The current implementation only deflates 256 pages even when a user > specifies more than that via the oom_pages module param. This patch > enables the deflating of up to oom_pages pages if there are enough > inflated pages. > > Signed-off-by: Wei Wang <wei.w.wang at intel.com> > Cc: Michael S. Tsirkin <mst

On Fri, Oct 20, 2017 at 07:54:25PM +0800, Wei Wang wrote: > The current implementation only deflates 256 pages even when a user > specifies more than that via the oom_pages module param. This patch > enables the deflating of up to oom_pages pages if there are enough > inflated pages. > > Signed-off-by: Wei Wang <wei.w.wang at intel.com> > Cc: Michael S. Tsirkin <mst

.... > > However, the new feature is about optimization, not correctness. > In fact, VIRTIO_BALLOON_F_SILENT_DEFLATE is the optimization > feature that VIRTIO_BALLOON_F_MUST_TELL_HOST was meant to be. > > What I'm interested in, is drivers that can _optionally_ use silent > deflation (as an optimization). These should not get a fake balloon! > > With the new feature bit, these drivers should propose both > VIRTIO_BALLOON_F_GUEST_TELLS_HOST and VIRTIO_BALLOON_F_SILENT_DEFLATE. > The driver can then use silent deflation if and only if the host > has negotiated...

...rewritten when they come out of the balloon. However this is the >>> behavior we have now so it would only require specification >>> documentation changes. >> >> Right now, for simplicity, I prefer this and define >> VIRTIO_BALLOON_F_PAGE_POISON only for explicit deflation (balloon >> deflation via the deflate queue) and implicit deflation >> (VIRTIO_BALLOON_F_REPORTING). > > I don't recall us talking about the explicit deflation case before. The interesting part is that drivers/virtio/virtio_balloon.c mentions: "Let the hypervisor know...

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