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    SubjectRe: [PATCH] spinlock metering (2.3.42)


    On Wed, 9 Feb 2000, John Hawkes wrote:

    > The kernel_flag is still the biggest culprit in 2.3.28 and it accounts
    > for
    > almost all of the witnessed wait-time cycles (157msec of the 160msec
    > total). A call in ext2_get_block() accounts for 45msec of this 157msec.
    > The largest hold-time occurs in do_close() -- that 15msec mentioned

    Almost definitely dput() work.

    > earlier -- with a mean hold-time of 59usec (microsec). Other long holds
    > are done by sys_unlink() (10msec max), sys_open() (5.5msec), and
    Ditto. Interesting...
    > sys_execvs() (2msec).

    Most likely we are dealing with dcache stuff. Sorry, it will have to wait.
    Sigh...


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