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    SubjectRe: [PATCH] obsolete config in kernel source (BUFFER_DEBUG)
    On Mon, 8 Feb 2010 10:50:31 -0500 wrote:

    > I don't have an objection with removing this, but does anyone have the
    > latest version of akpm's buffer debugging patches?

    My version is datestamped four years ago :( It normally forward-ports
    fairly easily.

    > I *think* what happened is that akpm forward ported the removed buffer
    > debugging patches, or maybe rewrote it from scratch, but for whatever
    > reason they never made back into mainline. Maybe they were too ugly
    > to live in mainline, but they have been really handy on occasion.

    I think Eric Sandeen might have a fresher version. Nowadays it should
    be done with the tracing infrastructure, I guess. Although that
    infrastructure may not be able to do this - the ext3 debug patch
    recorded an LRU array of the below structs within every buffer_head.
    The various BUFFER_TRACE macros would emit a new record into the tail of the
    target bh's b[] ring.

    struct buffer_history {
    struct buffer_history_item {
    char *function;
    char *info;
    unsigned long b_state;
    unsigned b_list:3;
    unsigned b_jlist:4;
    unsigned pg_dirty:1;
    unsigned cpu:3;
    unsigned b_count:8;
    unsigned long b_blocknr; /* For src != dest */
    #if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE)
    unsigned b_jcount:4;
    unsigned b_jbd:1;
    unsigned b_transaction:1;
    unsigned b_next_transaction:1;
    unsigned b_cp_transaction:1;
    unsigned b_trans_is_running:1;
    unsigned b_trans_is_committing:1;
    void *b_frozen_data;
    void *b_committed_data;
    unsigned long b_history_head; /* Next place to write */
    unsigned long b_history_tail; /* Oldest valid entry */

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