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    SubjectRe: [PATCHSET] printk: implement printk_header() and merging printk, take #2
    Matthew Wilcox wrote:
    > On Mon, Jan 21, 2008 at 02:13:52PM +0900, Tejun Heo wrote:
    >> In a nutshell, printk_header() lets you do the following atomically
    >> (against other messages).
    >>
    >> code:
    >> printk(KERN_INFO "ata1.00: ", "line0\nline1\nline2\n");
    >>
    >> output:
    >> <6>ata1.00: line0
    >> <6> line1
    >> <6> line2
    >
    > I think this is a really bad idea. It's much better to have:
    >
    > <6>ata1.00: line0
    > <6>ata1.00: line1
    > <6>ata1.00: line2
    >
    > That way you can grep for ata1.00 and get all messages relevant to that
    > device.

    It has some pros and cons. Having indentation makes things easier on
    human eyes but more difficult on scripts, but not too difficult -
    indented lines can easily be matched with a bit of scripting. Changing
    the behavior is easy but I'm still inclined toward indentation because
    printing header every line loses information about message boundaries.
    Maybe there's a way to satisfy both like omitting the separator from the
    second line on.

    ata1.00: line0
    ata1.00 line1
    ata1.00 line2

    Hmm... Any better ideas?

    --
    tejun


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