From: Mathieu Desnoyers Date: Thu, 1 Sep 2016 22:08:15 +0000 (-0400) Subject: Fix: handle large number of pages or subbuffers per buffer X-Git-Tag: v2.8.1~1 X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=6e4fc6f36d68fb3c8d40113f8670eb6e9c8ffd76;p=lttng-modules.git Fix: handle large number of pages or subbuffers per buffer Do no trigger kernel console warnings when we try to allocate too many pages, or a too large kmalloc area for page array (within a subbuffer), or a sub-buffer array (within a buffer). Use vmalloc/vfree for the "pages" local variable used only during allocation, which is an array of nr_subbuf * nr_pages_per_subbuf pointers. This ensures we do not limit the overall buffer size due to kmalloc limitations. Fixes #1031 Signed-off-by: Mathieu Desnoyers --- diff --git a/lib/ringbuffer/ring_buffer_backend.c b/lib/ringbuffer/ring_buffer_backend.c index c7f2fe9d..27554a1e 100644 --- a/lib/ringbuffer/ring_buffer_backend.c +++ b/lib/ringbuffer/ring_buffer_backend.c @@ -27,6 +27,7 @@ #include #include #include +#include #include /* for wrapper_vmalloc_sync_all() */ #include @@ -64,22 +65,23 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config num_subbuf_alloc++; } - pages = kmalloc_node(ALIGN(sizeof(*pages) * num_pages, + pages = vmalloc_node(ALIGN(sizeof(*pages) * num_pages, 1 << INTERNODE_CACHE_SHIFT), - GFP_KERNEL, cpu_to_node(max(bufb->cpu, 0))); + cpu_to_node(max(bufb->cpu, 0))); if (unlikely(!pages)) goto pages_error; bufb->array = kmalloc_node(ALIGN(sizeof(*bufb->array) * num_subbuf_alloc, 1 << INTERNODE_CACHE_SHIFT), - GFP_KERNEL, cpu_to_node(max(bufb->cpu, 0))); + GFP_KERNEL | __GFP_NOWARN, + cpu_to_node(max(bufb->cpu, 0))); if (unlikely(!bufb->array)) goto array_error; for (i = 0; i < num_pages; i++) { pages[i] = alloc_pages_node(cpu_to_node(max(bufb->cpu, 0)), - GFP_KERNEL | __GFP_ZERO, 0); + GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, 0); if (unlikely(!pages[i])) goto depopulate; } @@ -93,7 +95,8 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config sizeof(struct lib_ring_buffer_backend_page) * num_pages_per_subbuf, 1 << INTERNODE_CACHE_SHIFT), - GFP_KERNEL, cpu_to_node(max(bufb->cpu, 0))); + GFP_KERNEL | __GFP_NOWARN, + cpu_to_node(max(bufb->cpu, 0))); if (!bufb->array[i]) goto free_array; } @@ -103,7 +106,8 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config sizeof(struct lib_ring_buffer_backend_subbuffer) * num_subbuf, 1 << INTERNODE_CACHE_SHIFT), - GFP_KERNEL, cpu_to_node(max(bufb->cpu, 0))); + GFP_KERNEL | __GFP_NOWARN, + cpu_to_node(max(bufb->cpu, 0))); if (unlikely(!bufb->buf_wsb)) goto free_array; @@ -122,7 +126,8 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config sizeof(struct lib_ring_buffer_backend_counts) * num_subbuf, 1 << INTERNODE_CACHE_SHIFT), - GFP_KERNEL, cpu_to_node(max(bufb->cpu, 0))); + GFP_KERNEL | __GFP_NOWARN, + cpu_to_node(max(bufb->cpu, 0))); if (unlikely(!bufb->buf_cnt)) goto free_wsb; @@ -145,7 +150,7 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config * will not fault. */ wrapper_vmalloc_sync_all(); - kfree(pages); + vfree(pages); return 0; free_wsb: @@ -159,7 +164,7 @@ depopulate: __free_page(pages[i]); kfree(bufb->array); array_error: - kfree(pages); + vfree(pages); pages_error: return -ENOMEM; } diff --git a/lib/ringbuffer/ring_buffer_frontend.c b/lib/ringbuffer/ring_buffer_frontend.c index 74af7c67..2ffe991b 100644 --- a/lib/ringbuffer/ring_buffer_frontend.c +++ b/lib/ringbuffer/ring_buffer_frontend.c @@ -206,7 +206,8 @@ int lib_ring_buffer_create(struct lib_ring_buffer *buf, kzalloc_node(ALIGN(sizeof(*buf->commit_hot) * chan->backend.num_subbuf, 1 << INTERNODE_CACHE_SHIFT), - GFP_KERNEL, cpu_to_node(max(cpu, 0))); + GFP_KERNEL | __GFP_NOWARN, + cpu_to_node(max(cpu, 0))); if (!buf->commit_hot) { ret = -ENOMEM; goto free_chanbuf; @@ -216,7 +217,8 @@ int lib_ring_buffer_create(struct lib_ring_buffer *buf, kzalloc_node(ALIGN(sizeof(*buf->commit_cold) * chan->backend.num_subbuf, 1 << INTERNODE_CACHE_SHIFT), - GFP_KERNEL, cpu_to_node(max(cpu, 0))); + GFP_KERNEL | __GFP_NOWARN, + cpu_to_node(max(cpu, 0))); if (!buf->commit_cold) { ret = -ENOMEM; goto free_commit;