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Fix the hotspot 

Valgrind seems to be quite happy with it now.
This commit is contained in:
Přemysl Eric Janouch 2014-09-24 00:54:38 +02:00
parent bdb3b9b959
commit 734931d84f
1 changed files with 18 additions and 8 deletions
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26
utils.c
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@ -1161,22 +1161,29 @@ poller_set (struct poller *self, struct poller_fd *fd)
modifying ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, fd->fd, &event) != -1);
}
// FIXME: this is by far the slowest function in the whole program
static int
poller_compare_fds (const void *ax, const void *bx)
{
const struct epoll_event *ay = ax, *by = bx;
struct poller_fd *a = ay->data.ptr, *b = by->data.ptr;
return a->fd - b->fd;
}
static void
poller_remove_from_dispatch (struct poller *self, const struct poller_fd *fd)
{
if (!self->dispatch_total)
return;
int i;
for (i = self->dispatch_next; i < self->dispatch_total; i++)
if (self->revents[i].data.ptr == fd)
break;
if (i == self->dispatch_total)
struct epoll_event key = { .data.ptr = (void *) fd }, *fd_event;
if (!(fd_event = bsearch (&key, self->revents,
self->dispatch_total, sizeof *self->revents, poller_compare_fds)))
return;
if (i != --self->dispatch_total)
self->revents[i] = self->revents[self->dispatch_total];
ssize_t i = fd_event - self->revents;
if (i < self->dispatch_next)
self->dispatch_next--;
memmove (fd_event, fd_event + 1, (--self->dispatch_total - i) * sizeof key);
}
static void
@ -1219,6 +1226,9 @@ poller_run (struct poller *self)
poller_timers_dispatch (&self->timers);
poller_idle_dispatch (self->idle);
// Sort them by file descriptor number for binary search
qsort (self->revents, n_fds, sizeof *self->revents, poller_compare_fds);
while (self->dispatch_next < self->dispatch_total)
{
struct epoll_event *revents = self->revents + self->dispatch_next;