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Commit 14f966e7 authored by Robert Jennings's avatar Robert Jennings Committed by Benjamin Herrenschmidt
Browse files

powerpc/pseries: CMO unused page hinting 



Adds support for the "unused" page hint which can be used in shared
memory partitions to flag pages not in use, which will then be stolen
before active pages by the hypervisor when memory needs to be moved to
LPARs in need of additional memory.  Failure to mark pages as 'unused'
makes the LPAR slower to give up unused memory to other partitions.

This adds the kernel parameter 'cmo_free_hint' to disable this
functionality.

Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarRobert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent d69a78d7

Documentation/kernel-parameters.txt

+7 −0
Original line number Diff line number Diff line
@@ -497,6 +497,13 @@ and is between 256 and 4096 characters. It is defined in the file 
			Also note the kernel might malfunction if you disable

			some critical bits.



	cmo_free_hint=	[PPC] Format: { yes | no }

			Specify whether pages are marked as being inactive

			when they are freed.  This is used in CMO environments

			to determine OS memory pressure for page stealing by

			a hypervisor.

			Default: yes



	code_bytes	[X86] How many bytes of object code to print

			in an oops report.

			Range: 0 - 8192

arch/powerpc/include/asm/page.h

+5 −0
Original line number Diff line number Diff line
@@ -231,6 +231,11 @@ extern void copy_user_page(void *to, void *from, unsigned long vaddr, 
		struct page *p);

extern int page_is_ram(unsigned long pfn);



#ifdef CONFIG_PPC_SMLPAR

void arch_free_page(struct page *page, int order);

#define HAVE_ARCH_FREE_PAGE

#endif



struct vm_area_struct;



typedef struct page *pgtable_t;

arch/powerpc/platforms/pseries/lpar.c

+52 −0
Original line number Diff line number Diff line
@@ -609,3 +609,55 @@ void __init hpte_init_lpar(void) 
	ppc_md.flush_hash_range	= pSeries_lpar_flush_hash_range;

	ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;

}



#ifdef CONFIG_PPC_SMLPAR

#define CMO_FREE_HINT_DEFAULT 1

static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;



static int __init cmo_free_hint(char *str)

{

	char *parm;

	parm = strstrip(str);



	if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {

		printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");

		cmo_free_hint_flag = 0;

		return 1;

	}



	cmo_free_hint_flag = 1;

	printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");



	if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)

		return 1;



	return 0;

}



__setup("cmo_free_hint=", cmo_free_hint);



static void pSeries_set_page_state(struct page *page, int order,

				   unsigned long state)

{

	int i, j;

	unsigned long cmo_page_sz, addr;



	cmo_page_sz = cmo_get_page_size();

	addr = __pa((unsigned long)page_address(page));



	for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {

		for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)

			plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);

	}

}



void arch_free_page(struct page *page, int order)

{

	if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))

		return;



	pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);

}

EXPORT_SYMBOL(arch_free_page);



#endif