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Two minor optimizations of fdalloc():

Browse source 
- if minfd < fd_freefile (as is most often the case, since minfd is
   usually 0), set it to fd_freefile.

 - remove a call to fd_first_free() which duplicates work already done
   by fdused().

This change results in a small but measurable speedup for processes
with large numbers (several thousands) of open files.

PR:		kern/85176
Submitted by:	Divacky Roman <xdivac02@stud.fit.vutbr.cz>
MFC after:	3 weeks
This commit is contained in:
Dag-Erling Smørgrav 2005-08-26 11:16:39 +00:00
parent 1d5cfebaca
commit d09dfa2bfd
1 changed files with 3 additions and 1 deletions
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4
sys/kern/kern_descrip.c
View file

@ -1238,6 +1238,9 @@ fdalloc(struct thread *td, int minfd, int *result)
FILEDESC_LOCK_ASSERT(fdp, MA_OWNED);
if (fdp->fd_freefile > minfd)
minfd = fdp->fd_freefile;
PROC_LOCK(p);
maxfd = min((int)lim_cur(p, RLIMIT_NOFILE), maxfilesperproc);
PROC_UNLOCK(p);
@ -1267,7 +1270,6 @@ fdalloc(struct thread *td, int minfd, int *result)
("free descriptor isn't"));
fdp->fd_ofileflags[fd] = 0; /* XXX needed? */
fdused(fdp, fd);
fdp->fd_freefile = fd_first_free(fdp, fd, fdp->fd_nfiles);
*result = fd;
return (0);
}