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Revision 8ef8286689c6b5bc76212437b85bdd2ba749ee44 authored by Christoph Lameter on 20 February 2007, 21:57:52 UTC, committed by Linus Torvalds on 21 February 2007, 01:10:13 UTC 
[PATCH] slab: reduce size of alien cache to cover only possible nodes
 
The alien cache is a per cpu per node array allocated for every slab on the
system.  Currently we size this array for all nodes that the kernel does
support.  For IA64 this is 1024 nodes.  So we allocate an array with 1024
objects even if we only boot a system with 4 nodes.

This patch uses "nr_node_ids" to determine the number of possible nodes
supported by a hardware configuration and only allocates an alien cache
sized for possible nodes.

The initialization of nr_node_ids occurred too late relative to the bootstrap
of the slab allocator and so I moved the setup_nr_node_ids() into
free_area_init_nodes().

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 53b8a31
Raw File
system.c 
/*
 * system.c - a driver for reserving pnp system resources
 *
 * Some code is based on pnpbios_core.c
 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 */

#include <linux/pnp.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/ioport.h>

static const struct pnp_device_id pnp_dev_table[] = {
	/* General ID for reserving resources */
	{	"PNP0c02",		0	},
	/* memory controller */
	{	"PNP0c01",		0	},
	{	"",			0	}
};

static void reserve_range(char *pnpid, int start, int end, int port)
{
	struct resource *res;
	char *regionid;

	regionid = kmalloc(16, GFP_KERNEL);
	if (regionid == NULL)
		return;
	snprintf(regionid, 16, "pnp %s", pnpid);
	if (port)
		res = request_region(start,end-start+1,regionid);
	else
		res = request_mem_region(start,end-start+1,regionid);
	if (res == NULL)
		kfree(regionid);
	else
		res->flags &= ~IORESOURCE_BUSY;
	/*
	 * Failures at this point are usually harmless. pci quirks for
	 * example do reserve stuff they know about too, so we may well
	 * have double reservations.
	 */
	printk(KERN_INFO
		"pnp: %s: %s range 0x%x-0x%x %s reserved\n",
		pnpid, port ? "ioport" : "iomem", start, end,
		NULL != res ? "has been" : "could not be");
}

static void reserve_resources_of_dev(struct pnp_dev *dev)
{
	int i;

	for (i = 0; i < PNP_MAX_PORT; i++) {
		if (!pnp_port_valid(dev, i))
			continue;
		if (pnp_port_start(dev, i) == 0)
			continue;	/* disabled */
		if (pnp_port_start(dev, i) < 0x100)
			/*
			 * Below 0x100 is only standard PC hardware
			 * (pics, kbd, timer, dma, ...)
			 * We should not get resource conflicts there,
			 * and the kernel reserves these anyway
			 * (see arch/i386/kernel/setup.c).
			 * So, do nothing
			 */
			continue;
		if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
			continue;	/* invalid */

		reserve_range(dev->dev.bus_id, pnp_port_start(dev, i),
			pnp_port_end(dev, i), 1);
	}

	for (i = 0; i < PNP_MAX_MEM; i++) {
		if (!pnp_mem_valid(dev, i))
			continue;

		reserve_range(dev->dev.bus_id, pnp_mem_start(dev, i),
			pnp_mem_end(dev, i), 0);
	}

	return;
}

static int system_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
{
	reserve_resources_of_dev(dev);
	return 0;
}

static struct pnp_driver system_pnp_driver = {
	.name		= "system",
	.id_table	= pnp_dev_table,
	.flags		= PNP_DRIVER_RES_DO_NOT_CHANGE,
	.probe		= system_pnp_probe,
	.remove		= NULL,
};

static int __init pnp_system_init(void)
{
	return pnp_register_driver(&system_pnp_driver);
}

/**
 * Reserve motherboard resources after PCI claim BARs,
 * but before PCI assign resources for uninitialized PCI devices
 */
fs_initcall(pnp_system_init);
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