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Commit | Line | Data |
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2cb7cef9 BS |
1 | Subject: powerpc: Update page in counter for CMM |
2 | From: Brian King <brking@linux.vnet.ibm.com> | |
3 | References: 445540 - LTC49942 | |
4 | ||
5 | A new field has been added to the VPA as a method for | |
6 | the client OS to communicate to firmware the number of | |
7 | page ins it is performing when running collaborative | |
8 | memory overcommit. The hypervisor will use this information | |
9 | to better determine if a partition is experiencing memory | |
10 | pressure and needs more memory allocated to it. | |
11 | ||
12 | Signed-off-by: Brian King <brking@linux.vnet.ibm.com> | |
13 | Signed-off-by: Robert Jennings <rcjenn@linux.vnet.ibm.com> | |
14 | Signed-off-by: Olaf Hering <olh@suse.de> | |
15 | ||
16 | --- | |
17 | ||
18 | arch/powerpc/include/asm/lppaca.h | 3 ++- | |
19 | arch/powerpc/kernel/paca.c | 1 + | |
20 | arch/powerpc/mm/fault.c | 12 ++++++++++-- | |
21 | 3 files changed, 13 insertions(+), 3 deletions(-) | |
22 | ||
23 | --- a/arch/powerpc/include/asm/lppaca.h | |
24 | +++ b/arch/powerpc/include/asm/lppaca.h | |
25 | @@ -133,7 +133,8 @@ struct lppaca { | |
26 | //============================================================================= | |
27 | // CACHE_LINE_4-5 0x0180 - 0x027F Contains PMC interrupt data | |
28 | //============================================================================= | |
29 | - u8 pmc_save_area[256]; // PMC interrupt Area x00-xFF | |
30 | + u32 page_ins; // CMO Hint - # page ins by OS x00-x04 | |
31 | + u8 pmc_save_area[252]; // PMC interrupt Area x04-xFF | |
32 | } __attribute__((__aligned__(0x400))); | |
33 | ||
34 | extern struct lppaca lppaca[]; | |
35 | --- a/arch/powerpc/kernel/paca.c | |
36 | +++ b/arch/powerpc/kernel/paca.c | |
37 | @@ -36,6 +36,7 @@ struct lppaca lppaca[] = { | |
38 | .end_of_quantum = 0xfffffffffffffffful, | |
39 | .slb_count = 64, | |
40 | .vmxregs_in_use = 0, | |
41 | + .page_ins = 0, | |
42 | }, | |
43 | }; | |
44 | ||
45 | --- a/arch/powerpc/mm/fault.c | |
46 | +++ b/arch/powerpc/mm/fault.c | |
47 | @@ -30,6 +30,7 @@ | |
48 | #include <linux/kprobes.h> | |
49 | #include <linux/kdebug.h> | |
50 | ||
51 | +#include <asm/firmware.h> | |
52 | #include <asm/page.h> | |
53 | #include <asm/pgtable.h> | |
54 | #include <asm/mmu.h> | |
55 | @@ -318,9 +319,16 @@ good_area: | |
56 | goto do_sigbus; | |
57 | BUG(); | |
58 | } | |
59 | - if (ret & VM_FAULT_MAJOR) | |
60 | + if (ret & VM_FAULT_MAJOR) { | |
61 | current->maj_flt++; | |
62 | - else | |
63 | +#ifdef CONFIG_PPC_SMLPAR | |
64 | + if (firmware_has_feature(FW_FEATURE_CMO)) { | |
65 | + preempt_disable(); | |
66 | + get_lppaca()->page_ins += (1 << PAGE_FACTOR); | |
67 | + preempt_enable(); | |
68 | + } | |
69 | +#endif | |
70 | + } else | |
71 | current->min_flt++; | |
72 | up_read(&mm->mmap_sem); | |
73 | return 0; |