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Re: [Xen-devel] [PATCH 1/1] xen/gnttab: print log at level XENLOG_ERR before panic
- To: George Dunlap <george.dunlap@xxxxxxxxxx>, Dongli Zhang <dongli.zhang@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 23 Apr 2019 17:00:51 +0100
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- Cc: sstabellini@xxxxxxxxxx, wei.liu2@xxxxxxxxxx, konrad.wilk@xxxxxxxxxx, George.Dunlap@xxxxxxxxxxxxx, tim@xxxxxxx, ian.jackson@xxxxxxxxxxxxx, julien.grall@xxxxxxx, jbeulich@xxxxxxxx
- Delivery-date: Tue, 23 Apr 2019 16:02:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 23/04/2019 12:47, George Dunlap wrote:
> On 4/23/19 11:37 AM, Andrew Cooper wrote:
>> On 22/04/2019 13:39, Dongli Zhang wrote:
>>> Print log at level XENLOG_ERR (instead XENLOG_INFO) as domain_crash()
>>> indicates there is fatal error.
>>>
>>> Signed-off-by: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
>>> ---
>>> xen/common/grant_table.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
>>> index 80728ea..725c618 100644
>>> --- a/xen/common/grant_table.c
>>> +++ b/xen/common/grant_table.c
>>> @@ -1282,7 +1282,7 @@ unmap_common(
>>> if ( unlikely((rd = rcu_lock_domain_by_id(dom)) == NULL) )
>>> {
>>> /* This can happen when a grant is implicitly unmapped. */
>>> - gdprintk(XENLOG_INFO, "Could not find domain %d\n", dom);
>>> + gdprintk(XENLOG_ERR, "Could not find domain %d\n", dom);
>> While I agree with the change in principle, what does this actually do?
>> The entire printk() is compiled out in release builds, and debug builds
>> log all messages.
> ...by default; but presumably you can turn that down, right?
Yes you can, but a) noone does, because these are debug builds and b)
that isn't the point. If we care about this message being printed, it
mustn’t be a gdprintk().
It either wants to turn into a gprintk() at XENLOG_INFO, or wants
deleting entirely, but simply shuffling the exact level for a gdprintk()
is tantamount to useless.
>
> This also changes the prefix in the log output, right? That would make
> it easier to identify which message is important for undertanding why
> your domain just crashed.
The prefix is completely internal to Xen. By the time it ends up in the
console ring, the data is lost.
~Andrew
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