January 2018
Intermediate to advanced
456 pages
12h 49m
English
Content preview from Embedded Linux Development Using Yocto Project Cookbook - Second Edition
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How it works...
Once you have gathered the tracing data, you can process it with blkparse as follows:
# blkparse mmcblk2
This provides an stdout output for all the gathered data, and a final summary, as follows:
Input file mmcblk2.blktrace.0 added Input file mmcblk2.blktrace.1 added Input file mmcblk2.blktrace.2 added 179,0 0 1 0.000000000 645 A WS 1056768 + 24 <- (179,1) 1048576 179,0 0 2 0.000005667 645 Q WS 1056768 + 24 [dd] 179,0 0 3 0.000021667 645 G WS 1056768 + 24 [dd] 179,0 0 4 0.000029000 645 P N [dd] 179,0 0 5 0.000047334 645 I WS 1056768 + 24 [dd] 179,0 0 6 0.000054667 645 U N [dd] 1 179,0 0 7 0.000104667 95 D WS 1056768 + 24 [mmcqd/2] 179,0 0 8 0.711890667 95 C WS 1056768 + 24 [0] 179,0 0 9 0.712024667 645 A WSM 25184 + 8 <- ...
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