From: Brian King <brking@linux.vnet.ibm.com>
To: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org, Milton Miller <miltonm@bga.com>
Subject: [PATCHv2 1/1] powerpc: Update page in counter for CMM
Date: Tue, 21 Oct 2008 15:27:02 -0500 [thread overview]
Message-ID: <48FE3B16.5050402@linux.vnet.ibm.com> (raw)
In-Reply-To: <200810210436.m9L4aepT056796@sullivan.realtime.net>
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>
---
arch/powerpc/include/asm/lppaca.h | 3 ++-
arch/powerpc/kernel/paca.c | 1 +
arch/powerpc/mm/fault.c | 7 +++++--
3 files changed, 8 insertions(+), 3 deletions(-)
diff -puN arch/powerpc/mm/fault.c~powerpc_vrm_mm_pressure arch/powerpc/mm/fault.c
--- linux-2.6/arch/powerpc/mm/fault.c~powerpc_vrm_mm_pressure 2008-10-20 17:13:25.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/mm/fault.c 2008-10-21 14:52:24.000000000 -0500
@@ -318,9 +318,12 @@ good_area:
goto do_sigbus;
BUG();
}
- if (ret & VM_FAULT_MAJOR)
+ if (ret & VM_FAULT_MAJOR) {
current->maj_flt++;
- else
+ preempt_disable();
+ get_lppaca()->page_ins++;
+ preempt_enable();
+ } else
current->min_flt++;
up_read(&mm->mmap_sem);
return 0;
diff -puN arch/powerpc/include/asm/lppaca.h~powerpc_vrm_mm_pressure arch/powerpc/include/asm/lppaca.h
--- linux-2.6/arch/powerpc/include/asm/lppaca.h~powerpc_vrm_mm_pressure 2008-10-20 17:13:25.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/include/asm/lppaca.h 2008-10-21 13:46:45.000000000 -0500
@@ -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[];
diff -puN arch/powerpc/kernel/paca.c~powerpc_vrm_mm_pressure arch/powerpc/kernel/paca.c
--- linux-2.6/arch/powerpc/kernel/paca.c~powerpc_vrm_mm_pressure 2008-10-20 17:13:25.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/kernel/paca.c 2008-10-20 17:13:25.000000000 -0500
@@ -37,6 +37,7 @@ struct lppaca lppaca[] = {
.end_of_quantum = 0xfffffffffffffffful,
.slb_count = 64,
.vmxregs_in_use = 0,
+ .page_ins = 0,
},
};
_
next prev parent reply other threads:[~2008-10-21 20:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-20 22:19 [PATCH 1/1] powerpc: Update page in counter for CMM Brian King
2008-10-21 4:36 ` [1/1] " Milton Miller
2008-10-21 20:24 ` Brian King
2008-10-21 20:27 ` Brian King [this message]
2008-10-22 0:11 ` [PATCHv2 1/1] " Benjamin Herrenschmidt
2008-10-22 15:53 ` [PATCHv3 " Brian King
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