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    SubjectRe: Printk mulitple line message support
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    On Mon, 2011-11-14 at 14:58 +0800, Huang Ying wrote:
    > Hi,
    >
    > In most cases, printk only guarantees messages from different printk
    > calling will not be interleaved between each other. But many printk
    > users uses multiple line to form a complete message and call printk
    > for each line. So the following situation is possible for two printk
    > users running on two CPUs.
    >
    > line 1 of message from printk user1
    > line 1 of message from printk user2
    > line 2 of message from printk user1
    > line 2 of message from printk user2
    >
    > This makes kernel log hard to read. One possible solution to this
    > issue is to give a sequence number (or ID) to each complete message.
    > So the above lines will be:
    >
    > {1}line 1 of message from printk user1
    > {2}line 1 of message from printk user2
    > {1}line 2 of message from printk user1
    > {2}line 2 of message from printk user2
    >
    > Then some simple script can be used to group lines together according
    > to sequence number in lines.
    >
    > What do you think about that?

    This makes the typical multi-part but non-interleaved
    output difficult to read.

    How about determining if there is interleaving and
    emitting sequence # only in those cases?

    Perhaps test the atomic for the last sequence #.




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