[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v4] xen/balloon: add late_initcall_sync() for initial ballooning done
- To: Juergen Gross <jgross@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Fri, 5 Nov 2021 08:18:19 -0400
- Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none
- Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=x8/rz+OH4OwGFbijOPoJfOcgZgB7bM1t+vg5tMMe7xE=; b=mxOABSZIbXdYxv90cchRUKBFAj8T8oNcMVnXi8RrGYGWjnHyoqVRwPqS8iKy4YBFVlPa2fKV3PXCrD4EP5ylCQY8DAqcj9+04/KfFlu5zMY69yVWq2GSJwfWSu35EaJ2IS2gVlxBasUiXgdrWcMuSa7ZE3SRaKSw0XEf+06HnJgXd2X4WN33qEU3HVLu1hoHDP74hNZyLTwiXUpzLgwqAujoVIF1cGkq11Ja1FXU3NBJkxCi/NLsb7nv8sfJT0gCPTZQca8UQKUhSLnfNqYl6Fuu+X9ofrLb+DsVTu1nBRdIHjK1yUqJqfZDJKqnsojC7CGc2MxltUd+bpQ2GUI6SQ==
- Arc-seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=JGCq5y2MTQKorvGqHlA3hhCaT6llmjosfiy89RkYEWD1/JAmQz7LtWzB02MuKd1RCcVZwLSHIMhPiupcKVPI/slycCl9kL2B2PcS1s7WNX2yH4ZLPSPa7+D1gvubhLpuf0kY+PqyFmLLjBqRWXDD4nE0UuyQ+fy7vJC5MsU43qyhMIPave9Z8y7gDlUJHfYh9Vc99U8y6pgn/MsopY6RfaCkzLO9+FTTt0r301JGxrH9T3BTg+hjDEvNh/KaJN/lBFHInAlF5ert+gle2Sa8br/onwZL7DpG+vFLGaWIBr4+tdZd1fyx/kjII/Sbdr70qrkkSVJuRTfKf9s8NdTp2g==
- Authentication-results: suse.com; dkim=none (message not signed) header.d=none;suse.com; dmarc=none action=none header.from=oracle.com;
- Cc: Jonathan Corbet <corbet@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, stable@xxxxxxxxxxxxxxx, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 05 Nov 2021 12:18:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11/2/21 5:19 AM, Juergen Gross wrote:
When running as PVH or HVM guest with actual memory < max memory the
hypervisor is using "populate on demand" in order to allow the guest
to balloon down from its maximum memory size. For this to work
correctly the guest must not touch more memory pages than its target
memory size as otherwise the PoD cache will be exhausted and the guest
is crashed as a result of that.
In extreme cases ballooning down might not be finished today before
the init process is started, which can consume lots of memory.
In order to avoid random boot crashes in such cases, add a late init
call to wait for ballooning down having finished for PVH/HVM guests.
Warn on console if initial ballooning fails, panic() after stalling
for more than 3 minutes per default. Add a module parameter for
changing this timeout.
Cc: <stable@xxxxxxxxxxxxxxx>
Reported-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Applied to for-linus-5-16b.
-boris
|
