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| author | davidxu <davidxu@FreeBSD.org> | 2010-10-09 02:50:23 +0000 |
|---|---|---|
| committer | davidxu <davidxu@FreeBSD.org> | 2010-10-09 02:50:23 +0000 |
| commit | 55194e796cd9e8eb27d9bb4ec9f07184e390d01a (patch) | |
| tree | 84ad0652e39fc58da6ca522cc6bf55a188109780 /sys/kern/kern_fork.c | |
| parent | 6afff59f3c11c8f879672f8dbcb0a74bcbae79a5 (diff) | |
| download | FreeBSD-src-55194e796cd9e8eb27d9bb4ec9f07184e390d01a.zip FreeBSD-src-55194e796cd9e8eb27d9bb4ec9f07184e390d01a.tar.gz | |
Create a global thread hash table to speed up thread lookup, use
rwlock to protect the table. In old code, thread lookup is done with
process lock held, to find a thread, kernel has to iterate through
process and thread list, this is quite inefficient.
With this change, test shows in extreme case performance is
dramatically improved.
Earlier patch was reviewed by: jhb, julian
Diffstat (limited to 'sys/kern/kern_fork.c')
| -rw-r--r-- | sys/kern/kern_fork.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c index 81631f6..da2c415 100644 --- a/sys/kern/kern_fork.c +++ b/sys/kern/kern_fork.c @@ -456,7 +456,7 @@ again: AUDIT_ARG_PID(p2->p_pid); LIST_INSERT_HEAD(&allproc, p2, p_list); LIST_INSERT_HEAD(PIDHASH(p2->p_pid), p2, p_hash); - + tidhash_add(td2); PROC_LOCK(p2); PROC_LOCK(p1); |
