diff options
| author | dillon <dillon@FreeBSD.org> | 2002-04-04 21:38:47 +0000 |
|---|---|---|
| committer | dillon <dillon@FreeBSD.org> | 2002-04-04 21:38:47 +0000 |
| commit | a74c71d7cd207a74d1a201cb8b58253e42e412bf (patch) | |
| tree | 145ba66a57ff6db67725dd5e965f3db61810cc51 /sys/i386 | |
| parent | cc9830e3c2e98230b0991e00e57a5c2706cbad81 (diff) | |
| download | FreeBSD-src-a74c71d7cd207a74d1a201cb8b58253e42e412bf.zip FreeBSD-src-a74c71d7cd207a74d1a201cb8b58253e42e412bf.tar.gz | |
Embed a struct vmmeter in the per-cpu structure and add a macro,
PCPU_LAZY_INC() which increments elements in it for cases where we
can afford the occassional inaccuracy. Use of per-cpu stats counters
avoids significant cache stalls in various critical paths that would
otherwise severely limit our cpu scaleability.
Adjust all sysctl's accessing cnt.* elements to now use a procedure
which aggregates the requested field for all cpus and for the global
vmmeter.
The global vmmeter is retained, since some stats counters, like v_free_min,
cannot be made per-cpu. Also, this allows us to convert counters from
the global vmmeter to the per-cpu vmmeter in a piecemeal fashion, so
have at it!
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/i386/trap.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c index b039284..30af1b6 100644 --- a/sys/i386/i386/trap.c +++ b/sys/i386/i386/trap.c @@ -941,7 +941,11 @@ syscall(frame) int args[8]; u_int code; - atomic_add_int(&cnt.v_syscall, 1); + /* + * note: PCPU_LAZY_INC() can only be used if we can afford + * occassional inaccuracy in the count. + */ + PCPU_LAZY_INC(cnt.v_syscall); #ifdef DIAGNOSTIC if (ISPL(frame.tf_cs) != SEL_UPL) { |
