On 9/20/18 8:32 AM, Mateusz Guzik wrote:
fd: prevent inlining of _fdrop thorough kern_descrip.c
fdrop is used in several places in the file and almost never has to call
_fdrop. Thus inlining it is a pure waste of space.
-int
+int __noinline
_fdrop(struct file *fp, struct thread *td)
I wonder if some compilers have an attribute for "cold" versus "hot"
that would indicate that the function is called seldom versus often. It
could influence not only inlining, but also prediction of branches that
lead to an unconditional call to it.
Eric
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