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    SubjectRe: [PATCH] perf tools: Dont use openat()
    Ulrich Drepper a écrit :
    > -----BEGIN PGP SIGNED MESSAGE-----
    > Hash: SHA1
    >
    > Eric Dumazet wrote:
    >>> We can certainly remove that reliance - wanna send a patch for it?
    >
    > Come on, the silliness has to stop. The kernel must be recent and to
    > use it adequately the C library also must be recent. And "recent" is
    > not even correct anymore: the functions are available for more then two
    > years. Removing the use of the modern interfaces makes everything
    > slower and might even re-introduce race conditions my patch fixed.
    >

    First time I ear that C library *must* be recent. This was never
    mentionned in Documentation/Changes, "Minimal Requirements"

    "perf list" can be 100x slower, and even racy, I dont mind. At all.

    $ time perf list >/dev/null 2>/dev/null

    real 0m0.001s
    user 0m0.000s
    sys 0m0.001s

    With openat(), I cannot use "perf" on machines I can only change kernel,
    since changing glibc is too risky for legacy apps. I could use static and
    private glibc, but last time I tried this I lost few hours and failed.

    If modern interfaces means : "Upgrade glibc or die, silly you..."
    I prefer to be silly, and keep increasing linux usability, even
    if I dont have the chance to have a modern lab with up2date distros.

    BTW, oprofile compiles perfectly on RHEL4 and 'old' glibc.

    Thanks
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