[PATCH 6/9] net: use kvmalloc with __GFP_REPEAT rather than open coded variant
From: Michal Hocko <mhocko@kernel.org>
Date: 2017-01-30 09:50:12
Also in:
linux-mm, lkml
Subsystem:
networking [general], tc subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Jamal Hadi Salim, Jiri Pirko, Linus Torvalds
From: Michal Hocko <mhocko@suse.com> fq_alloc_node, alloc_netdev_mqs and netif_alloc* open code kmalloc with vmalloc fallback. Use the kvmalloc variant instead. Keep the __GFP_REPEAT flag based on explanation from Eric: " At the time, tests on the hardware I had in my labs showed that vmalloc() could deliver pages spread all over the memory and that was a small penalty (once memory is fragmented enough, not at boot time) " The way how the code is constructed means, however, that we prefer to go and hit the OOM killer before we fall back to the vmalloc for requests <=32kB (with 4kB pages) in the current code. This is rather disruptive for something that can be achived with the fallback. On the other hand __GFP_REPEAT doesn't have any useful semantic for these requests. So the effect of this patch is that requests smaller than 64kB will fallback to vmalloc esier now. Cc: Eric Dumazet <edumazet@google.com> Cc: netdev@vger.kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> --- net/core/dev.c | 24 +++++++++--------------- net/sched/sch_fq.c | 12 +----------- 2 files changed, 10 insertions(+), 26 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index be11abac89b3..707e730821a6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -7081,12 +7081,10 @@ static int netif_alloc_rx_queues(struct net_device *dev) BUG_ON(count < 1); - rx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); - if (!rx) { - rx = vzalloc(sz); - if (!rx) - return -ENOMEM; - } + rx = kvzalloc(sz, GFP_KERNEL | __GFP_REPEAT); + if (!rx) + return -ENOMEM; + dev->_rx = rx; for (i = 0; i < count; i++)
@@ -7123,12 +7121,10 @@ static int netif_alloc_netdev_queues(struct net_device *dev) if (count < 1 || count > 0xffff) return -EINVAL; - tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); - if (!tx) { - tx = vzalloc(sz); - if (!tx) - return -ENOMEM; - } + tx = kvzalloc(sz, GFP_KERNEL | __GFP_REPEAT); + if (!tx) + return -ENOMEM; + dev->_tx = tx; netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
@@ -7661,9 +7657,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, /* ensure 32-byte alignment of whole construct */ alloc_size += NETDEV_ALIGN - 1; - p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); - if (!p) - p = vzalloc(alloc_size); + p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_REPEAT); if (!p) return NULL;
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index a4f738ac7728..594f77d89f6c 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c@@ -624,16 +624,6 @@ static void fq_rehash(struct fq_sched_data *q, q->stat_gc_flows += fcnt; } -static void *fq_alloc_node(size_t sz, int node) -{ - void *ptr; - - ptr = kmalloc_node(sz, GFP_KERNEL | __GFP_REPEAT | __GFP_NOWARN, node); - if (!ptr) - ptr = vmalloc_node(sz, node); - return ptr; -} - static void fq_free(void *addr) { kvfree(addr);
@@ -650,7 +640,7 @@ static int fq_resize(struct Qdisc *sch, u32 log) return 0; /* If XPS was setup, we can allocate memory on right NUMA node */ - array = fq_alloc_node(sizeof(struct rb_root) << log, + array = kvmalloc_node(sizeof(struct rb_root) << log, GFP_KERNEL | __GFP_REPEAT, netdev_queue_numa_node_read(sch->dev_queue)); if (!array) return -ENOMEM;
--
2.11.0
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