On 12/15/2015 12:21 PM, Ming Lei wrote:
...
+/* Called from syscall, and the code is borrowed from blk_mq */
+static int htab_pre_alloc_elems(struct bpf_htab *htab)
+{
+ const unsigned max_order = 4;
+ unsigned elem_size = htab->elem_size, i;
+ unsigned nr_entries = htab->map.max_entries;
+ size_t left = nr_entries * elem_size;
+
+ htab->elems = kzalloc(nr_entries * sizeof(struct htab_elem *),
+ GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
Should this use GFP_USER (same below)?
Also, when having a large number of elements e.g. > 1Mio, should we fall
back to vzalloc()?
+ if (!htab->elems)
+ goto fail;
+
+ INIT_LIST_HEAD(&htab->page_list);
+
+ for (i = 0; i < nr_entries; ) {
+ int this_order = max_order;
+ struct page *page;
+ int j, to_do;
+ void *p;
+
+ while (left < order_to_size(this_order - 1) && this_order)
+ this_order--;
+
+ do {
+ page = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
+ __GFP_NORETRY | __GFP_ZERO,
+ this_order);
+ if (page)
+ break;
...
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