Commit 40900194 authored by Brian King's avatar Brian King Committed by Paul Mackerras
Browse files

powerpc: Update page-in counter for CMM 



A new field has been added to the VPA as a method for the client OS to
communicate to firmware the number of page-ins it is performing when
running collaborative memory overcommit.  The hypervisor will use this
information to better determine if a partition is experiencing memory
pressure and needs more memory allocated to it.

Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 1ef8014d

arch/powerpc/include/asm/lppaca.h

+2 −1
Original line number Diff line number Diff line
@@ -133,7 +133,8 @@ struct lppaca { 
//=============================================================================

// CACHE_LINE_4-5 0x0180 - 0x027F Contains PMC interrupt data

//=============================================================================

	u8	pmc_save_area[256];	// PMC interrupt Area           x00-xFF

	u32	page_ins;			// CMO Hint - # page ins by OS  x00-x04

	u8	pmc_save_area[252];	// PMC interrupt Area           x04-xFF

} __attribute__((__aligned__(0x400)));



extern struct lppaca lppaca[];

arch/powerpc/kernel/paca.c

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ struct lppaca lppaca[] = { 
		.end_of_quantum = 0xfffffffffffffffful,

		.slb_count = 64,

		.vmxregs_in_use = 0,

		.page_ins = 0,

	},

};

arch/powerpc/mm/fault.c

+10 −2
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <linux/kprobes.h>

#include <linux/kdebug.h>



#include <asm/firmware.h>

#include <asm/page.h>

#include <asm/pgtable.h>

#include <asm/mmu.h>
@@ -318,9 +319,16 @@ good_area: 
			goto do_sigbus;

		BUG();

	}

	if (ret & VM_FAULT_MAJOR)

	if (ret & VM_FAULT_MAJOR) {

		current->maj_flt++;

	else

#ifdef CONFIG_PPC_SMLPAR

		if (firmware_has_feature(FW_FEATURE_CMO)) {

			preempt_disable();

			get_lppaca()->page_ins++;

			preempt_enable();

		}

#endif

	} else

		current->min_flt++;

	up_read(&mm->mmap_sem);

	return 0;

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