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    SubjectRe: [RFC] ps command race fix
    On Tue, 25 Jul 2006 11:50:04 +0900
    KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

    > BTW, how large pids and how many proccess in a (heavy and big) system ?
    >
    I found
    /*
    * A maximum of 4 million PIDs should be enough for a while.
    * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]
    */
    #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
    (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))

    ...we have to manage 4 millions tids.

    I'll try to make use of pidmap array which is already maintained in pid.c
    and to avoid using extra memory.

    Thanks,
    -Kame

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