• Christian Borntraeger's avatar
    KVM: async_pf: do not warn on page allocation failures · c579f2af
    Christian Borntraeger authored
    commit d7444794 upstream.
    
    In async_pf we try to allocate with NOWAIT to get an element quickly
    or fail. This code also handle failures gracefully. Lets silence
    potential page allocation failures under load.
    
    qemu-system-s39: page allocation failure: order:0,mode:0x2200000
    [...]
    Call Trace:
    ([<00000000001146b8>] show_trace+0xf8/0x148)
    [<000000000011476a>] show_stack+0x62/0xe8
    [<00000000004a36b8>] dump_stack+0x70/0x98
    [<0000000000272c3a>] warn_alloc_failed+0xd2/0x148
    [<000000000027709e>] __alloc_pages_nodemask+0x94e/0xb38
    [<00000000002cd36a>] new_slab+0x382/0x400
    [<00000000002cf7ac>] ___slab_alloc.constprop.30+0x2dc/0x378
    [<00000000002d03d0>] kmem_cache_alloc+0x160/0x1d0
    [<0000000000133db4>] kvm_setup_async_pf+0x6c/0x198
    [<000000000013dee8>] kvm_arch_vcpu_ioctl_run+0xd48/0xd58
    [<000000000012fcaa>] kvm_vcpu_ioctl+0x372/0x690
    [<00000000002f66f6>] do_vfs_ioctl+0x3be/0x510
    [<00000000002f68ec>] SyS_ioctl+0xa4/0xb8
    [<0000000000781c5e>] system_call+0xd6/0x264
    [<000003ffa24fa06a>] 0x3ffa24fa06a
    Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
    Reviewed-by: default avatarDominik Dingel <dingel@linux.vnet.ibm.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
    c579f2af
async_pf.c 5.45 KB