Messages in this thread Patch in this message |  | | | Date | Fri, 18 Feb 2011 20:47:10 -0600 | | From | Mike Travis <> | | Subject | [PATCH 5/6] printk: Minimize time zero output |
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Reduce the length for time zero messages by only printing "[0] ".
v2: updated to apply to x86-tip
Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Jack Steiner <steiner@sgi.com> Reviewed-by: Robin Holt <holt@sgi.com> --- kernel/printk.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) --- linux.orig/kernel/printk.c +++ linux/kernel/printk.c @@ -735,9 +735,14 @@ static inline int printk_emit_time(void) unsigned long microsec_rem; t = cpu_clock(printk_cpu); - microsec_rem = do_div(t, 1000000000) / 1000; - tlen = sprintf(tbuf, "[%5lu.%06lu] ", (unsigned long)t, microsec_rem); - + if (likely(t)) { + microsec_rem = do_div(t, 1000000000) / 1000; + tlen = sprintf(tbuf, "[%5lu.%06lu] ", + (unsigned long)t, microsec_rem); + } else { + /* reduce byte count in log when time is zero */ + tlen = sprintf(tbuf, "[0] "); + } for (tp = tbuf; tp < tbuf + tlen; tp++) emit_log_char(*tp); --
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