// In some cases there is no way to simply release
// resources, such as statistics, so donate them to
// a different mcache (the recipient).
func freemcache(c *mcache) {
	systemstack(func() {
		c.releaseAll()
		stackcache_clear(c)

		// NOTE(rsc,rlh): If gcworkbuffree comes back, we need to coordinate
		// with the stealing of gcworkbufs during garbage collection to avoid
		// a race where the workbuf is double-freed.

//
// The world must be stopped.
//
//go:nowritebarrier
func flushmcache(i int) {
	assertWorldStopped()

	p := allp[i]
	c := p.mcache
	if c == nil {
		return
	}
	c.releaseAll()
	stackcache_clear(c)
}

// flushallmcaches flushes the mcaches of all Ps.
//
// The world must be stopped.
//
//go:nowritebarrier
func flushallmcaches() {
	assertWorldStopped()

		stackpoolfree(x, order)
		x = y
		size -= fixedStack << order
	}
	unlock(&stackpool[order].item.mu)
	c.stackcache[order].list = x
	c.stackcache[order].size = size
}

//go:systemstack
func stackcache_clear(c *mcache) {
	if stackDebug >= 1 {
		print("stackcache clear\n")
	}
	for order := uint8(0); order < _NumStackOrders; order++ {
		lock(&stackpool[order].item.mu)
		x := c.stackcache[order].list