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powerpc: Update page-in counter for CMM

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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: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Brian King 2008-10-22 05:53:45 +00:00 committed by Paul Mackerras
parent 1ef8014deb
commit 409001948d
3 changed files with 13 additions and 3 deletions
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3
arch/powerpc/include/asm/lppaca.h
View File

@ -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[];

1
arch/powerpc/kernel/paca.c
View File

@ -37,6 +37,7 @@ struct lppaca lppaca[] = {
.end_of_quantum = 0xfffffffffffffffful,
.slb_count = 64,
.vmxregs_in_use = 0,
.page_ins = 0,
},
};

12
arch/powerpc/mm/fault.c
View File

@ -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 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
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;