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authorMichal Hocko <mhocko@suse.com>2017-05-09 01:57:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-09 03:15:12 +0300
commita7c3e901a46ff54c016d040847eda598a9e3e653 (patch)
treed149d70d420ff19586daa827db47a2e26a5598fe /arch
parent60f3e00d25b44e3aa51846590d1e10f408466a83 (diff)
downloadlinux-a7c3e901a46ff54c016d040847eda598a9e3e653.tar.xz
mm: introduce kv[mz]alloc helpers
Patch series "kvmalloc", v5. There are many open coded kmalloc with vmalloc fallback instances in the tree. Most of them are not careful enough or simply do not care about the underlying semantic of the kmalloc/page allocator which means that a) some vmalloc fallbacks are basically unreachable because the kmalloc part will keep retrying until it succeeds b) the page allocator can invoke a really disruptive steps like the OOM killer to move forward which doesn't sound appropriate when we consider that the vmalloc fallback is available. As it can be seen implementing kvmalloc requires quite an intimate knowledge if the page allocator and the memory reclaim internals which strongly suggests that a helper should be implemented in the memory subsystem proper. Most callers, I could find, have been converted to use the helper instead. This is patch 6. There are some more relying on __GFP_REPEAT in the networking stack which I have converted as well and Eric Dumazet was not opposed [2] to convert them as well. [1] http://lkml.kernel.org/r/20170130094940.13546-1-mhocko@kernel.org [2] http://lkml.kernel.org/r/1485273626.16328.301.camel@edumazet-glaptop3.roam.corp.google.com This patch (of 9): Using kmalloc with the vmalloc fallback for larger allocations is a common pattern in the kernel code. Yet we do not have any common helper for that and so users have invented their own helpers. Some of them are really creative when doing so. Let's just add kv[mz]alloc and make sure it is implemented properly. This implementation makes sure to not make a large memory pressure for > PAGE_SZE requests (__GFP_NORETRY) and also to not warn about allocation failures. This also rules out the OOM killer as the vmalloc is a more approapriate fallback than a disruptive user visible action. This patch also changes some existing users and removes helpers which are specific for them. In some cases this is not possible (e.g. ext4_kvmalloc, libcfs_kvzalloc) because those seems to be broken and require GFP_NO{FS,IO} context which is not vmalloc compatible in general (note that the page table allocation is GFP_KERNEL). Those need to be fixed separately. While we are at it, document that __vmalloc{_node} about unsupported gfp mask because there seems to be a lot of confusion out there. kvmalloc_node will warn about GFP_KERNEL incompatible (which are not superset) flags to catch new abusers. Existing ones would have to die slowly. [sfr@canb.auug.org.au: f2fs fixup] Link: http://lkml.kernel.org/r/20170320163735.332e64b7@canb.auug.org.au Link: http://lkml.kernel.org/r/20170306103032.2540-2-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Reviewed-by: Andreas Dilger <adilger@dilger.ca> [ext4 part] Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: John Hubbard <jhubbard@nvidia.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/lapic.c4
-rw-r--r--arch/x86/kvm/page_track.c4
-rw-r--r--arch/x86/kvm/x86.c4
3 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index bad6a25067bc..d2a892fc92bf 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -177,8 +177,8 @@ static void recalculate_apic_map(struct kvm *kvm)
if (kvm_apic_present(vcpu))
max_id = max(max_id, kvm_x2apic_id(vcpu->arch.apic));
- new = kvm_kvzalloc(sizeof(struct kvm_apic_map) +
- sizeof(struct kvm_lapic *) * ((u64)max_id + 1));
+ new = kvzalloc(sizeof(struct kvm_apic_map) +
+ sizeof(struct kvm_lapic *) * ((u64)max_id + 1), GFP_KERNEL);
if (!new)
goto out;
diff --git a/arch/x86/kvm/page_track.c b/arch/x86/kvm/page_track.c
index 60168cdd0546..ea67dc876316 100644
--- a/arch/x86/kvm/page_track.c
+++ b/arch/x86/kvm/page_track.c
@@ -40,8 +40,8 @@ int kvm_page_track_create_memslot(struct kvm_memory_slot *slot,
int i;
for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) {
- slot->arch.gfn_track[i] = kvm_kvzalloc(npages *
- sizeof(*slot->arch.gfn_track[i]));
+ slot->arch.gfn_track[i] = kvzalloc(npages *
+ sizeof(*slot->arch.gfn_track[i]), GFP_KERNEL);
if (!slot->arch.gfn_track[i])
goto track_free;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ccbd45ecd41a..ee22226e3807 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8199,13 +8199,13 @@ int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
slot->base_gfn, level) + 1;
slot->arch.rmap[i] =
- kvm_kvzalloc(lpages * sizeof(*slot->arch.rmap[i]));
+ kvzalloc(lpages * sizeof(*slot->arch.rmap[i]), GFP_KERNEL);
if (!slot->arch.rmap[i])
goto out_free;
if (i == 0)
continue;
- linfo = kvm_kvzalloc(lpages * sizeof(*linfo));
+ linfo = kvzalloc(lpages * sizeof(*linfo), GFP_KERNEL);
if (!linfo)
goto out_free;