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    SubjectSuggested code change : Simple : Scale pdflush threads from desktop to server
    Date
    Group,

    pdflush threads clean dirty pages

    Under the past simple assumption that a greater number of
    page daemon threads will have the TENDENCY to clean
    the pages faster.

    Another assumption is that a server will have at least 2x / 4x the
    number of drives and memory, so allocating more pdflush() threads
    makes sense.

    Relying on a recent change, code base on whether the system is
    a desktop or a server, scale the number of pdthreads() which would
    result in the below code change.

    The suggestion is to double the MIN number of threads and set the
    MAX number to 4x.

    ./mm/pdflush.c
    /* Scale for a server */
    #define MIN_PDFLUSH_THREADS 4 /* 2x desktop value */
    #define MAX_PDFLUSH_THREADS 32 /* 4x desktop value */


    /*
    * secondary suggestion is to add a DEBUG type /var/log/system
    messages that
    * will rate limit independent of desktop or server.
    */

    else if (nr_pdflush_threads == MAX_PDFLUSH_THREADS) {
    /* optional PDFLUSH msg */
    if (printk_ratelimit() {
    printk(KERN_INFO "MAX_PDFLUSH_THREADS
    Limited\n");
    }
    }





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