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    SubjectRe: [PATCH] 2.6.0-test4 -- add context switch counters
    Mike, your MUA sucks; you unwittingly removed yourself from Reply-To:


    On Tue, Aug 26, 2003 at 06:29:14PM -0700, Mike Fedyk wrote:
    > Command exited with non-zero status 100
    > Command being timed: "apt-get update"
    > User time (seconds): 0.01
    > System time (seconds): 0.00
    > Percent of CPU this job got: 6%
    > Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.32
    > Average shared text size (kbytes): 0
    > Average unshared data size (kbytes): 0
    > Average stack size (kbytes): 0
    > Average total size (kbytes): 0
    > The averages might be nice...

    The averages themselves aren't reported with getrusage(), only direct
    usage measurements. Presumably luserspace computes the averages itself.
    i.e. the counters are all for non-average versions of these stats and
    (because we're seeing all 0's) are not reported at all.


    On Tue, Aug 26, 2003 at 06:29:14PM -0700, Mike Fedyk wrote:
    > Maximum resident set size (kbytes): 0
    > But the maximum would allow any polling app to do its polling less often.
    > As well as the averages above...
    > Average resident set size (kbytes): 0
    > Major (requiring I/O) page faults: 320
    > Minor (reclaiming a frame) page faults: 21

    The fault counters are vaguely bogus when threads are involved. There's
    a comment alluding to that nearby.


    On Tue, Aug 26, 2003 at 06:29:14PM -0700, Mike Fedyk wrote:
    > Voluntary context switches: 0
    > How can you have voluntary context switches in a preemptive environment?
    > Involuntary context switches: 0

    Irrelevant to CONFIG_PREEMPT; preemptive multitasking (i.e. userspace can
    be preempted) as UNIX has always done is the important issue here.


    On Tue, Aug 26, 2003 at 06:29:14PM -0700, Mike Fedyk wrote:
    > Swaps: 0
    > Counting swaps would be nice too.

    This already has two counters in the task_t (no, I will not use Finnish
    Hungarian notation in my general posts) that are 100% unused. Probably
    the only thing preventing slab poison from showing up there outright is
    the whole task_t copy in kernel/fork.c and the bss zeroing for init_task.


    On Tue, Aug 26, 2003 at 06:29:14PM -0700, Mike Fedyk wrote:
    > File system inputs: 0
    > File system outputs: 0
    > Socket messages sent: 0
    > Socket messages received: 0
    > Signals delivered: 0
    > Yes, yes, yes.

    These would be easy to set up, they just need counters and the ticking
    of the counters dropped in.


    On Tue, Aug 26, 2003 at 06:29:14PM -0700, Mike Fedyk wrote:
    > Page size (bytes): 4096
    > Exit status: 100
    > One more thing:
    > $ cat /proc/meminfo
    > MemTotal: 320628 kB
    > MemFree: 5148 kB
    > Buffers: 8316 kB
    > Where'd shared go, and why didn't rmap start populating this value? It
    > should be there in the pte-chain lists...

    Shared isn't particularly useful as a single value unqualified by
    sharing level.


    On Tue, Aug 26, 2003 at 06:29:14PM -0700, Mike Fedyk wrote:
    > Cached: 127140 kB
    > SwapCached: 0 kB
    > Active: 266212 kB
    > Inactive: 10608 kB
    > HighTotal: 0 kB
    > HighFree: 0 kB
    > Why is high(total|free) there in a non-highmem kernel? If this file were
    > more dynamic, then we wouldn't have apps that counted on the line number
    > instead of the first colum's value...
    > Ok, so that was two more... ;)

    They could probably very well be omitted; in all likelihood just making
    the format more resistant to .config changes to make luserspace's life
    easier is a good reason to keep it there.


    -- wli
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