r...@haggis:~# dtrace -n 'fbt::ffs:entry { @ffs=count(); }
fbt::swtch:entry { @swtch=count(); }'
dtrace: description 'fbt::ffs:entry ' matched 2 probes
^C
14430
32989
Note: I suspect this is Xen specific...
On bare metal, ffs is called far less frequently, so an optimization will be
less significant:
r...@haggis:~# dtrace -n 'fbt::ffs:entry { @ffs=count(); } fbt::swtch:entry {
@swtch=count(); }'
dtrace: description 'fbt::ffs:entry ' matched 2 probes
^C
2787
565230
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