search for: deflat

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 "neg...

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 "neg...

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 ens...

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 red...

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 <- function(mod){ + subs <- 1:10 + update(mod, subset=subs) + } > f(mod.1) Call: lm(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

...S. Tsirkin ha scritto: > At this point I am confused. I think there are two changes in your patch: > > 1. Handling of VIRTIO_F_GUEST_MUST_TELL_HOST > Is this functionally identical to what I proposed? > If yes, I am fine with either change being applied. Yes. > 2. New SILENT_DEFLATE feature > Since guest can get same functionality by not acking > TELL_HOST, I still don't see what good it does: > Historically a host with no features supports silent > deflate and guest with no features can do silent deflate. > I conclude silent deflate is the default beh...

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 ca...

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 ca...

...here is a short dummy code to give an idea of what I am talking about: attach(longley) N <- length(Unemployed) block <- c( rep( "a", N), rep( "b", N), rep( "c", N) ) Unemployed.3 <- c(Unemployed + rnorm(1), Unemployed + rnorm(1), Unemployed + rnorm(1)) GNP.deflator.3 <- c(GNP.deflator + rnorm(1), GNP.deflator + rnorm(1), GNP.deflator + rnorm(1)) cor(Unemployed, GNP.deflator) cor(Unemployed.3, GNP.deflator.3) cor(Unemployed.3[block == "a"], GNP.deflator.3[block == "a"]) cor(Unemployed.3[block == "b"], GNP.deflator.3[block ==...

...k there are two changes in your patch: >>> >>> 1. Handling of VIRTIO_F_GUEST_MUST_TELL_HOST >>> Is this functionally identical to what I proposed? >>> If yes, I am fine with either change being applied. >> >> Yes. >> >>> 2. New SILENT_DEFLATE feature >>> Since guest can get same functionality by not acking >>> TELL_HOST, I still don't see what good it does: >>> Historically a host with no features supports silent >>> deflate and guest with no features can do silent deflate. >>> I co...

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 ca...

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 ca...

(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 47 73 11 c5 48 6c 8e b9 47 ca 71 92 46 8d dc aa 45 92 0e I?m trying to read it into R wi...

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 a...

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 a...

...nt I am confused. I think there are two changes in your patch: > > > > 1. Handling of VIRTIO_F_GUEST_MUST_TELL_HOST > > Is this functionally identical to what I proposed? > > If yes, I am fine with either change being applied. > > Yes. > > > 2. New SILENT_DEFLATE feature > > Since guest can get same functionality by not acking > > TELL_HOST, I still don't see what good it does: > > Historically a host with no features supports silent > > deflate and guest with no features can do silent deflate. > > I conclude silent d...

...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 kn...

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