Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets)


On Mon, 8 May 2006, Kris Kennaway wrote:

unp contention has risen a bit. The other big gain is to sleep mtxpool contention, which roughly doubled:

In the general case, you can increase the size of the mutex pool. However, since this is per-uid for the socket buffer resource limits, that won't help you as the same user will always contend with itself. We'll need to think about this some -- good activity for the plane today :-).

Nice work so far, btw. Sounds like we're making real headway!

Robert N M Watson


/*
* Change the total socket buffer size a user has used.
*/
int
chgsbsize(uip, hiwat, to, max)
struct uidinfo *uip;
u_int *hiwat;
u_int to;
rlim_t max;
{
rlim_t new;

UIDINFO_LOCK(uip);

So the next question is how can that be optimized?

Kris
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