| Message ID | 20190211224437.25267-6-daniel.m.jordan@oracle.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | use pinned_vm instead of locked_vm to account pinned pages | expand |
Hi Daniel,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on vfio/next]
[also build test ERROR on v5.0-rc4]
[cannot apply to next-20190212]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Daniel-Jordan/use-pinned_vm-instead-of-locked_vm-to-account-pinned-pages/20190213-070458
base: https://github.com/awilliam/linux-vfio.git next
config: powerpc-defconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 8.2.0-11) 8.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=8.2.0 make.cross ARCH=powerpc
All errors (new ones prefixed by >>):
In file included from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/kvm/book3s_64_vio.c: In function 'kvmppc_account_memlimit':
>> arch/powerpc/kvm/book3s_64_vio.c:70:42: error: passing argument 2 of 'atomic64_add_return_relaxed' from incompatible pointer type [-Werror=incompatible-pointer-types]
pinned_vm = atomic64_add_return(pages, ¤t->mm->pinned_vm);
^~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic.h:75:22: note: in definition of macro '__atomic_op_fence'
typeof(op##_relaxed(args)) __ret; \
^~~~
arch/powerpc/kvm/book3s_64_vio.c:70:15: note: in expansion of macro 'atomic64_add_return'
pinned_vm = atomic64_add_return(pages, ¤t->mm->pinned_vm);
^~~~~~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:7,
from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/include/asm/atomic.h:331:52: note: expected 'atomic64_t *' {aka 'struct <anonymous> *'} but argument is of type 'long unsigned int *'
atomic64_##op##_return_relaxed(long a, atomic64_t *v) \
~~~~~~~~~~~~^
arch/powerpc/include/asm/atomic.h:367:2: note: in expansion of macro 'ATOMIC64_OP_RETURN_RELAXED'
ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/atomic.h:370:1: note: in expansion of macro 'ATOMIC64_OPS'
ATOMIC64_OPS(add, add)
^~~~~~~~~~~~
In file included from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
>> arch/powerpc/kvm/book3s_64_vio.c:70:42: error: passing argument 2 of 'atomic64_add_return_relaxed' from incompatible pointer type [-Werror=incompatible-pointer-types]
pinned_vm = atomic64_add_return(pages, ¤t->mm->pinned_vm);
^~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic.h:77:23: note: in definition of macro '__atomic_op_fence'
__ret = op##_relaxed(args); \
^~~~
arch/powerpc/kvm/book3s_64_vio.c:70:15: note: in expansion of macro 'atomic64_add_return'
pinned_vm = atomic64_add_return(pages, ¤t->mm->pinned_vm);
^~~~~~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:7,
from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/include/asm/atomic.h:331:52: note: expected 'atomic64_t *' {aka 'struct <anonymous> *'} but argument is of type 'long unsigned int *'
atomic64_##op##_return_relaxed(long a, atomic64_t *v) \
~~~~~~~~~~~~^
arch/powerpc/include/asm/atomic.h:367:2: note: in expansion of macro 'ATOMIC64_OP_RETURN_RELAXED'
ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/atomic.h:370:1: note: in expansion of macro 'ATOMIC64_OPS'
ATOMIC64_OPS(add, add)
^~~~~~~~~~~~
>> arch/powerpc/kvm/book3s_64_vio.c:73:24: error: passing argument 2 of 'atomic64_sub' from incompatible pointer type [-Werror=incompatible-pointer-types]
atomic64_sub(pages, ¤t->mm->pinned_vm);
^~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:7,
from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/include/asm/atomic.h:315:58: note: expected 'atomic64_t *' {aka 'struct <anonymous> *'} but argument is of type 'long unsigned int *'
static __inline__ void atomic64_##op(long a, atomic64_t *v) \
~~~~~~~~~~~~^
arch/powerpc/include/asm/atomic.h:366:2: note: in expansion of macro 'ATOMIC64_OP'
ATOMIC64_OP(op, asm_op) \
^~~~~~~~~~~
arch/powerpc/include/asm/atomic.h:371:1: note: in expansion of macro 'ATOMIC64_OPS'
ATOMIC64_OPS(sub, subf)
^~~~~~~~~~~~
>> arch/powerpc/kvm/book3s_64_vio.c:76:29: error: passing argument 1 of 'atomic64_read' from incompatible pointer type [-Werror=incompatible-pointer-types]
pinned_vm = atomic64_read(¤t->mm->pinned_vm);
^~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:7,
from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/include/asm/atomic.h:300:56: note: expected 'const atomic64_t *' {aka 'const struct <anonymous> *'} but argument is of type 'long unsigned int *'
static __inline__ long atomic64_read(const atomic64_t *v)
~~~~~~~~~~~~~~~~~~^
arch/powerpc/kvm/book3s_64_vio.c:80:23: error: passing argument 2 of 'atomic64_sub' from incompatible pointer type [-Werror=incompatible-pointer-types]
atomic64_sub(pages, ¤t->mm->pinned_vm);
^~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:7,
from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/include/asm/atomic.h:315:58: note: expected 'atomic64_t *' {aka 'struct <anonymous> *'} but argument is of type 'long unsigned int *'
static __inline__ void atomic64_##op(long a, atomic64_t *v) \
~~~~~~~~~~~~^
arch/powerpc/include/asm/atomic.h:366:2: note: in expansion of macro 'ATOMIC64_OP'
ATOMIC64_OP(op, asm_op) \
^~~~~~~~~~~
arch/powerpc/include/asm/atomic.h:371:1: note: in expansion of macro 'ATOMIC64_OPS'
ATOMIC64_OPS(sub, subf)
^~~~~~~~~~~~
In file included from include/linux/kernel.h:14,
from include/linux/list.h:9,
from include/linux/preempt.h:11,
from include/linux/hardirq.h:5,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/kvm/book3s_64_vio.c:85:18: error: passing argument 1 of 'atomic64_read' from incompatible pointer type [-Werror=incompatible-pointer-types]
atomic64_read(¤t->mm->pinned_vm) << PAGE_SHIFT,
^~~~~~~~~~~~~~~~~~~~~~~
include/linux/printk.h:136:17: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~~~~~~~~~
arch/powerpc/kvm/book3s_64_vio.c:83:2: note: in expansion of macro 'pr_debug'
pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%lu %ld/%lu%s\n", current->pid,
^~~~~~~~
In file included from include/linux/atomic.h:7,
from include/linux/llist.h:63,
from include/linux/smp.h:15,
from include/linux/percpu.h:7,
from include/linux/context_tracking_state.h:5,
from include/linux/vtime.h:5,
from include/linux/hardirq.h:8,
from include/linux/kvm_host.h:10,
from arch/powerpc/kvm/book3s_64_vio.c:23:
arch/powerpc/include/asm/atomic.h:300:56: note: expected 'const atomic64_t *' {aka 'const struct <anonymous> *'} but argument is of type 'long unsigned int *'
static __inline__ long atomic64_read(const atomic64_t *v)
~~~~~~~~~~~~~~~~~~^
cc1: all warnings being treated as errors
vim +/atomic64_add_return_relaxed +70 arch/powerpc/kvm/book3s_64_vio.c
> 23 #include <linux/kvm_host.h>
24 #include <linux/highmem.h>
25 #include <linux/gfp.h>
26 #include <linux/slab.h>
27 #include <linux/sched/signal.h>
28 #include <linux/hugetlb.h>
29 #include <linux/list.h>
30 #include <linux/anon_inodes.h>
31 #include <linux/iommu.h>
32 #include <linux/file.h>
33
34 #include <asm/kvm_ppc.h>
35 #include <asm/kvm_book3s.h>
36 #include <asm/book3s/64/mmu-hash.h>
37 #include <asm/hvcall.h>
38 #include <asm/synch.h>
39 #include <asm/ppc-opcode.h>
40 #include <asm/kvm_host.h>
41 #include <asm/udbg.h>
42 #include <asm/iommu.h>
43 #include <asm/tce.h>
44 #include <asm/mmu_context.h>
45
46 static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
47 {
48 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
49 }
50
51 static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
52 {
53 unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) +
54 (tce_pages * sizeof(struct page *));
55
56 return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE;
57 }
58
59 static long kvmppc_account_memlimit(unsigned long pages, bool inc)
60 {
61 long ret = 0;
62 s64 pinned_vm;
63
64 if (!current || !current->mm)
65 return ret; /* process exited */
66
67 if (inc) {
68 unsigned long lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
69
> 70 pinned_vm = atomic64_add_return(pages, ¤t->mm->pinned_vm);
71 if (pinned_vm > lock_limit && !capable(CAP_IPC_LOCK)) {
72 ret = -ENOMEM;
> 73 atomic64_sub(pages, ¤t->mm->pinned_vm);
74 }
75 } else {
> 76 pinned_vm = atomic64_read(¤t->mm->pinned_vm);
77 if (WARN_ON_ONCE(pages > pinned_vm))
78 pages = pinned_vm;
79
80 atomic64_sub(pages, ¤t->mm->pinned_vm);
81 }
82
83 pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%lu %ld/%lu%s\n", current->pid,
84 inc ? '+' : '-', pages << PAGE_SHIFT,
85 atomic64_read(¤t->mm->pinned_vm) << PAGE_SHIFT,
86 rlimit(RLIMIT_MEMLOCK), ret ? " - exceeded" : "");
87
88 return ret;
89 }
90
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index 532ab79734c7..2f8d7c051e4e 100644 --- a/arch/powerpc/kvm/book3s_64_vio.c +++ b/arch/powerpc/kvm/book3s_64_vio.c @@ -56,39 +56,34 @@ static unsigned long kvmppc_stt_pages(unsigned long tce_pages) return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE; } -static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc) +static long kvmppc_account_memlimit(unsigned long pages, bool inc) { long ret = 0; + s64 pinned_vm; if (!current || !current->mm) return ret; /* process exited */ - down_write(¤t->mm->mmap_sem); - if (inc) { - unsigned long locked, lock_limit; + unsigned long lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - locked = current->mm->locked_vm + stt_pages; - lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - if (locked > lock_limit && !capable(CAP_IPC_LOCK)) + pinned_vm = atomic64_add_return(pages, ¤t->mm->pinned_vm); + if (pinned_vm > lock_limit && !capable(CAP_IPC_LOCK)) { ret = -ENOMEM; - else - current->mm->locked_vm += stt_pages; + atomic64_sub(pages, ¤t->mm->pinned_vm); + } } else { - if (WARN_ON_ONCE(stt_pages > current->mm->locked_vm)) - stt_pages = current->mm->locked_vm; + pinned_vm = atomic64_read(¤t->mm->pinned_vm); + if (WARN_ON_ONCE(pages > pinned_vm)) + pages = pinned_vm; - current->mm->locked_vm -= stt_pages; + atomic64_sub(pages, ¤t->mm->pinned_vm); } - pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%ld %ld/%ld%s\n", current->pid, - inc ? '+' : '-', - stt_pages << PAGE_SHIFT, - current->mm->locked_vm << PAGE_SHIFT, - rlimit(RLIMIT_MEMLOCK), - ret ? " - exceeded" : ""); - - up_write(¤t->mm->mmap_sem); + pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%lu %ld/%lu%s\n", current->pid, + inc ? '+' : '-', pages << PAGE_SHIFT, + atomic64_read(¤t->mm->pinned_vm) << PAGE_SHIFT, + rlimit(RLIMIT_MEMLOCK), ret ? " - exceeded" : ""); return ret; }
Memory used for TCE tables in kvm_vm_ioctl_create_spapr_tce is currently accounted to locked_vm because it stays resident and its allocation is directly triggered from userspace as explained in f8626985c7c2 ("KVM: PPC: Account TCE-containing pages in locked_vm"). However, since the memory comes straight from the page allocator (and to a lesser extent unreclaimable slab) and is effectively pinned, it should be accounted with pinned_vm (see bc3e53f682d9 ("mm: distinguish between mlocked and pinned pages")). pinned_vm recently became atomic and so no longer relies on mmap_sem held as writer: delete. Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com> --- arch/powerpc/kvm/book3s_64_vio.c | 35 ++++++++++++++------------------ 1 file changed, 15 insertions(+), 20 deletions(-)