* Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> [2010-02-13 18:59:52]: > * Wu Fengguang <fengguang.wu@xxxxxxxxx> [2010-02-10 00:21:01]: > > > > Here is a scratch patch to exercise the "object collections" idea :) > > > > > > Interestingly, the pagecache walk is pretty fast, while copying out the trace > > > data takes more time: > > > > > > # time (echo / > walk-fs) > > > (; echo / > walk-fs; ) 0.01s user 0.11s system 82% cpu 0.145 total > > > > > > # time wc /debug/tracing/trace > > > 4570 45893 551282 /debug/tracing/trace > > > wc /debug/tracing/trace 0.75s user 0.55s system 88% cpu 1.470 total > > > > Ah got it: it takes much time to "print" the raw trace data. > > > > > TODO: > > > > > > correctness > > > - show file path name > > > XXX: can trace_seq_path() be called directly inside TRACE_EVENT()? > > > > OK, finished with the file name with d_path(). I choose not to mangle > > the possible '\n' in file names, and simply show "?" for such files, > > for the sake of speed. > > > > Thanks, > > Fengguang > > --- > > tracing: pagecache object collections > > > > This dumps > > - all cached files of a mounted fs (the inode-cache) > > - all cached pages of a cached file (the page-cache) > > > > Usage and Sample output: > > > > # echo /dev > /debug/tracing/objects/mm/pages/walk-fs > > # tail /debug/tracing/trace > > zsh-2528 [000] 10429.172470: dump_inode: ino=889 size=0 cached=0 age=442 dirty=0 dev=0:18 file=/dev/console > > zsh-2528 [000] 10429.172472: dump_inode: ino=888 size=0 cached=0 age=442 dirty=7 dev=0:18 file=/dev/null > > zsh-2528 [000] 10429.172474: dump_inode: ino=887 size=40 cached=0 age=442 dirty=0 dev=0:18 file=/dev/shm > > zsh-2528 [000] 10429.172477: dump_inode: ino=886 size=40 cached=0 age=442 dirty=0 dev=0:18 file=/dev/pts > > zsh-2528 [000] 10429.172479: dump_inode: ino=885 size=11 cached=0 age=442 dirty=0 dev=0:18 file=/dev/core > > zsh-2528 [000] 10429.172481: dump_inode: ino=884 size=15 cached=0 age=442 dirty=0 dev=0:18 file=/dev/stderr > > zsh-2528 [000] 10429.172483: dump_inode: ino=883 size=15 cached=0 age=442 dirty=0 dev=0:18 file=/dev/stdout > > zsh-2528 [000] 10429.172486: dump_inode: ino=882 size=15 cached=0 age=442 dirty=0 dev=0:18 file=/dev/stdin > > zsh-2528 [000] 10429.172488: dump_inode: ino=881 size=13 cached=0 age=442 dirty=0 dev=0:18 file=/dev/fd > > zsh-2528 [000] 10429.172491: dump_inode: ino=872 size=13360 cached=0 age=442 dirty=0 dev=0:18 file=/dev > > > > Here "age" is either age from inode create time, or from last dirty time. > > > > It would be nice to see mapped/unmapped information as well. > OK, I see you got mapcount, thanks! -- Three Cheers, Balbir -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>