forked from MIPS/CI20_linux
-
Notifications
You must be signed in to change notification settings - Fork 23
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge branch 'fix-the-unmatched-unit_size-of-bpf_mem_cache'
Hou Tao says: ==================== Fix the unmatched unit_size of bpf_mem_cache From: Hou Tao <houtao1@huawei.com> Hi, The patchset aims to fix the reported warning [0] when the unit_size of bpf_mem_cache is mismatched with the object size of underly slab-cache. Patch #1 fixes the warning by adjusting size_index according to the value of KMALLOC_MIN_SIZE, so bpf_mem_cache with unit_size which is smaller than KMALLOC_MIN_SIZE or is not aligned with KMALLOC_MIN_SIZE will be redirected to bpf_mem_cache with bigger unit_size. Patch #2 doesn't do prefill for these redirected bpf_mem_cache to save memory. Patch #3 adds further error check in bpf_mem_alloc_init() to ensure the unit_size and object_size are always matched and to prevent potential issues due to the mismatch. Please see individual patches for more details. And comments are always welcome. [0]: https://lore.kernel.org/bpf/87jztjmmy4.fsf@all.your.base.are.belong.to.us ==================== Link: https://lore.kernel.org/r/20230908133923.2675053-1-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
- Loading branch information
Showing
3 changed files
with
256 additions
and
4 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* Copyright (C) 2023. Huawei Technologies Co., Ltd */ | ||
| #define _GNU_SOURCE | ||
| #include <sched.h> | ||
| #include <pthread.h> | ||
| #include <stdbool.h> | ||
| #include <bpf/btf.h> | ||
| #include <test_progs.h> | ||
|
|
||
| #include "test_bpf_ma.skel.h" | ||
|
|
||
| void test_test_bpf_ma(void) | ||
| { | ||
| struct test_bpf_ma *skel; | ||
| struct btf *btf; | ||
| int i, err; | ||
|
|
||
| skel = test_bpf_ma__open(); | ||
| if (!ASSERT_OK_PTR(skel, "open")) | ||
| return; | ||
|
|
||
| btf = bpf_object__btf(skel->obj); | ||
| if (!ASSERT_OK_PTR(btf, "btf")) | ||
| goto out; | ||
|
|
||
| for (i = 0; i < ARRAY_SIZE(skel->rodata->data_sizes); i++) { | ||
| char name[32]; | ||
| int id; | ||
|
|
||
| snprintf(name, sizeof(name), "bin_data_%u", skel->rodata->data_sizes[i]); | ||
| id = btf__find_by_name_kind(btf, name, BTF_KIND_STRUCT); | ||
| if (!ASSERT_GT(id, 0, "bin_data")) | ||
| goto out; | ||
| skel->rodata->data_btf_ids[i] = id; | ||
| } | ||
|
|
||
| err = test_bpf_ma__load(skel); | ||
| if (!ASSERT_OK(err, "load")) | ||
| goto out; | ||
|
|
||
| err = test_bpf_ma__attach(skel); | ||
| if (!ASSERT_OK(err, "attach")) | ||
| goto out; | ||
|
|
||
| skel->bss->pid = getpid(); | ||
| usleep(1); | ||
| ASSERT_OK(skel->bss->err, "test error"); | ||
| out: | ||
| test_bpf_ma__destroy(skel); | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* Copyright (C) 2023. Huawei Technologies Co., Ltd */ | ||
| #include <vmlinux.h> | ||
| #include <bpf/bpf_tracing.h> | ||
| #include <bpf/bpf_helpers.h> | ||
|
|
||
| #include "bpf_experimental.h" | ||
| #include "bpf_misc.h" | ||
|
|
||
| #ifndef ARRAY_SIZE | ||
| #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) | ||
| #endif | ||
|
|
||
| struct generic_map_value { | ||
| void *data; | ||
| }; | ||
|
|
||
| char _license[] SEC("license") = "GPL"; | ||
|
|
||
| const unsigned int data_sizes[] = {8, 16, 32, 64, 96, 128, 192, 256, 512, 1024, 2048, 4096}; | ||
| const volatile unsigned int data_btf_ids[ARRAY_SIZE(data_sizes)] = {}; | ||
|
|
||
| int err = 0; | ||
| int pid = 0; | ||
|
|
||
| #define DEFINE_ARRAY_WITH_KPTR(_size) \ | ||
| struct bin_data_##_size { \ | ||
| char data[_size - sizeof(void *)]; \ | ||
| }; \ | ||
| struct map_value_##_size { \ | ||
| struct bin_data_##_size __kptr * data; \ | ||
| /* To emit BTF info for bin_data_xx */ \ | ||
| struct bin_data_##_size not_used; \ | ||
| }; \ | ||
| struct { \ | ||
| __uint(type, BPF_MAP_TYPE_ARRAY); \ | ||
| __type(key, int); \ | ||
| __type(value, struct map_value_##_size); \ | ||
| __uint(max_entries, 128); \ | ||
| } array_##_size SEC(".maps"); | ||
|
|
||
| static __always_inline void batch_alloc_free(struct bpf_map *map, unsigned int batch, | ||
| unsigned int idx) | ||
| { | ||
| struct generic_map_value *value; | ||
| unsigned int i, key; | ||
| void *old, *new; | ||
|
|
||
| for (i = 0; i < batch; i++) { | ||
| key = i; | ||
| value = bpf_map_lookup_elem(map, &key); | ||
| if (!value) { | ||
| err = 1; | ||
| return; | ||
| } | ||
| new = bpf_obj_new_impl(data_btf_ids[idx], NULL); | ||
| if (!new) { | ||
| err = 2; | ||
| return; | ||
| } | ||
| old = bpf_kptr_xchg(&value->data, new); | ||
| if (old) { | ||
| bpf_obj_drop(old); | ||
| err = 3; | ||
| return; | ||
| } | ||
| } | ||
| for (i = 0; i < batch; i++) { | ||
| key = i; | ||
| value = bpf_map_lookup_elem(map, &key); | ||
| if (!value) { | ||
| err = 4; | ||
| return; | ||
| } | ||
| old = bpf_kptr_xchg(&value->data, NULL); | ||
| if (!old) { | ||
| err = 5; | ||
| return; | ||
| } | ||
| bpf_obj_drop(old); | ||
| } | ||
| } | ||
|
|
||
| #define CALL_BATCH_ALLOC_FREE(size, batch, idx) \ | ||
| batch_alloc_free((struct bpf_map *)(&array_##size), batch, idx) | ||
|
|
||
| DEFINE_ARRAY_WITH_KPTR(8); | ||
| DEFINE_ARRAY_WITH_KPTR(16); | ||
| DEFINE_ARRAY_WITH_KPTR(32); | ||
| DEFINE_ARRAY_WITH_KPTR(64); | ||
| DEFINE_ARRAY_WITH_KPTR(96); | ||
| DEFINE_ARRAY_WITH_KPTR(128); | ||
| DEFINE_ARRAY_WITH_KPTR(192); | ||
| DEFINE_ARRAY_WITH_KPTR(256); | ||
| DEFINE_ARRAY_WITH_KPTR(512); | ||
| DEFINE_ARRAY_WITH_KPTR(1024); | ||
| DEFINE_ARRAY_WITH_KPTR(2048); | ||
| DEFINE_ARRAY_WITH_KPTR(4096); | ||
|
|
||
| SEC("fentry/" SYS_PREFIX "sys_nanosleep") | ||
| int test_bpf_mem_alloc_free(void *ctx) | ||
| { | ||
| if ((u32)bpf_get_current_pid_tgid() != pid) | ||
| return 0; | ||
|
|
||
| /* Alloc 128 8-bytes objects in batch to trigger refilling, | ||
| * then free 128 8-bytes objects in batch to trigger freeing. | ||
| */ | ||
| CALL_BATCH_ALLOC_FREE(8, 128, 0); | ||
| CALL_BATCH_ALLOC_FREE(16, 128, 1); | ||
| CALL_BATCH_ALLOC_FREE(32, 128, 2); | ||
| CALL_BATCH_ALLOC_FREE(64, 128, 3); | ||
| CALL_BATCH_ALLOC_FREE(96, 128, 4); | ||
| CALL_BATCH_ALLOC_FREE(128, 128, 5); | ||
| CALL_BATCH_ALLOC_FREE(192, 128, 6); | ||
| CALL_BATCH_ALLOC_FREE(256, 128, 7); | ||
| CALL_BATCH_ALLOC_FREE(512, 64, 8); | ||
| CALL_BATCH_ALLOC_FREE(1024, 32, 9); | ||
| CALL_BATCH_ALLOC_FREE(2048, 16, 10); | ||
| CALL_BATCH_ALLOC_FREE(4096, 8, 11); | ||
|
|
||
| return 0; | ||
| } |