On Wed, Dec 4, 2013 at 10:02 AM, Lakshmi <sendtold@xxxxxxxxx> wrote: > Hi, > > I ran a blktrace with -a read mask and when i parsed it to txt > file,Along with Reads (R) I also see lots of Ns in the RWBS field. I think the N events indicates that new data structure has been allocated for the request. > What does this mean and how do I filter only the reads or writes in > this case? you can always filter blkparse output using grep > > The Blktrace and Blkparse statements I used are > > blktrace -w 130 -d /dev/sdb -a read -b 4096 -o 4K_RR_Trace > > blkparse > blkparse -i ./*.blktrace.0 -d ./bp.bin -o bp.txt -w 0:130 > > > > 8,16 12 1 0.000000000 8632 Q R 0 + 128 [vgdisplay] > 8,16 12 0 0.000008612 0 m N cfq8632S / alloced > 8,16 12 2 0.000008807 8632 G R 0 + 128 [vgdisplay] > 8,16 12 3 0.000009475 8632 P N [vgdisplay] > 8,16 12 4 0.000009686 8632 I R 0 + 128 [vgdisplay] > 8,16 12 0 0.000010338 0 m N cfq8632S / insert_request > 8,16 12 0 0.000010901 0 m N cfq8632S / add_to_rr > 8,16 12 0 0.000011620 0 m N cfq8632S / idle=0 > 8,16 12 5 0.000011907 8632 U N [vgdisplay] 1 > 8,16 12 0 0.000012643 0 m N cfq workload slice:30 > > Please help. > > Thanks > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrace" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
