Attachment 604741 Details for Bug 770000 – exclude virtio_balloon

[patch] exclude virtio_balloon

2 (text/plain), 1.26 KB, created by Dave Young on 2012-08-16 01:53:55 UTC

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Creator: Dave Young

Created: 2012-08-16 01:53:55 UTC

Size: 1.26 KB

patch

obsolete

>exclude virtio_balloon kernel module
>
>Resolves: bz770000
>
>kvm guest with balloon driver used will possibly oom and fail to capture vmcore.
>
>Copy comment from Rafael Aquini about the reason:
>---
>When memory ballooning is enabled for the guest, and the virtio_balloon driver is getting loaded into kdump's relocated kernel, the configured balloon target size will be "inherited" and the hypervisor will command the balloon driver to inflate a memory balloon up to its target. As the kdump relocated kernel boots within a memory constrained environment, the balloon memory inflation leads to the OOM-killer storm scenario that prevents kdump on proceeding with its task.
>---
>
>Inflate balloon in kdump kernel does not make sense, so here exclude the
>virtio_balloon module in dumprd.
>
>Testing:
>Tested by Rafael Aquini <aquini@redhat.com>
>
>Signed-off-by: Dave Young <dyoung@redhat.com>
>---
> mkdumprd |    2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>--- kexec-tools.orig/mkdumprd
>+++ kexec-tools/mkdumprd
>@@ -2597,7 +2597,7 @@ cat >> $MNTIMAGE/etc/passwd << EOF
> root:x:0:0:root:/root:/bin/bash
> EOF
> 
>-default_exclude_modules="snd soundcore cfg80211 mac80211 iwl"
>+default_exclude_modules="snd soundcore cfg80211 mac80211 iwl virtio_balloon"
> 
> # $1: module basename
> exclude_module() {

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Attachments on bug 770000: 549252 | 549253 | 604172 | 604740 | 604741