Lines Matching +full:system +full:- +full:trace

1 .TH ext4slower 8  "2016-02-11" "USER COMMANDS"
3 ext4slower \- Trace slow ext4 file operations, with per-event details.
5 .B ext4slower [\-h] [\-j] [\-p PID] [min_ms]
23 \-p PID
24 Trace this PID only.
27 Minimum I/O latency (duration) to trace, in milliseconds. Default is 10 ms.
30 Trace synchronous file reads and writes slower than 10 ms:
34 Trace slower than 1 ms:
38 Trace slower than 1 ms, and output just the fields in parsable format (csv):
40 .B ext4slower \-j 1
42 Trace all file reads and writes (warning: the output will be verbose):
46 Trace slower than 1 ms, for PID 181 only:
48 .B ext4slower \-p 181 1
72 file system CPU cycles, file system locks, run queue latency, etc. It's a more
74 system I/O, than to measure this down at the block device interface.
77 A cached kernel file name (comes from dentry->d_iname).
80 Completion timestamp, microseconds (\-j only).
83 File offset, bytes (\-j only).
86 Latency (duration) of the I/O, in microseconds (\-j only).
88 This adds low-overhead instrumentation to these ext4 operations,
89 including reads and writes from the file system cache. Such reads and writes
93 continues to be a problem, consider switching to a tool that prints in-kernel
109 Unstable - in development.