| Message ID | 20241028115850.3409893-1-linyunsheng@huawei.com (mailing list archive) |
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Replace page_frag with page_frag_cache (Part-2)
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This is part 2 of "Replace page_frag with page_frag_cache", which introduces the new API and replaces page_frag with page_frag_cache for sk_page_frag(). The part 1 of "Replace page_frag with page_frag_cache" is in [1]. After [2], there are still two implementations for page frag: 1. mm/page_alloc.c: net stack seems to be using it in the rx part with 'struct page_frag_cache' and the main API being page_frag_alloc_align(). 2. net/core/sock.c: net stack seems to be using it in the tx part with 'struct page_frag' and the main API being skb_page_frag_refill(). This patchset tries to unfiy the page frag implementation by replacing page_frag with page_frag_cache for sk_page_frag() first. net_high_order_alloc_disable_key for the implementation in net/core/sock.c doesn't seems matter that much now as pcp is also supported for high-order pages: commit 44042b449872 ("mm/page_alloc: allow high-order pages to be stored on the per-cpu lists") As the related change is mostly related to networking, so targeting the net-next. And will try to replace the rest of page_frag in the follow patchset. After this patchset: 1. Unify the page frag implementation by taking the best out of two the existing implementations: we are able to save some space for the 'page_frag_cache' API user, and avoid 'get_page()' for the old 'page_frag' API user. 2. Future bugfix and performance can be done in one place, hence improving maintainability of page_frag's implementation. Kernel Image changing: Linux Kernel total | text data bss ------------------------------------------------------ after 45250307 | 27274279 17209996 766032 before 45254134 | 27278118 17209984 766032 delta -3827 | -3839 +12 +0 Performance validation: 1. Using micro-benchmark ko added in patch 1 to test aligned and non-aligned API performance impact for the existing users, there is no notiable performance degradation. Instead we seems to have some major performance boot for both aligned and non-aligned API after switching to ptr_ring for testing, respectively about 200% and 10% improvement in arm64 server as below. 2. Use the below netcat test case, we also have some minor performance boot for replacing 'page_frag' with 'page_frag_cache' after this patchset. server: taskset -c 32 nc -l -k 1234 > /dev/null client: perf stat -r 200 -- taskset -c 0 head -c 20G /dev/zero | taskset -c 1 nc 127.0.0.1 1234 In order to avoid performance noise as much as possible, the testing is done in system without any other load and have enough iterations to prove the data is stable enough, complete log for testing is below: perf stat -r 200 -- insmod ./page_frag_test.ko test_push_cpu=16 test_pop_cpu=17 test_alloc_len=12 nr_test=51200000 perf stat -r 200 -- insmod ./page_frag_test.ko test_push_cpu=16 test_pop_cpu=17 test_alloc_len=12 nr_test=51200000 test_align=1 taskset -c 32 nc -l -k 1234 > /dev/null perf stat -r 200 -- taskset -c 0 head -c 20G /dev/zero | taskset -c 1 nc 127.0.0.1 1234 *After* this patchset: Performance counter stats for 'insmod ./page_frag_test.ko test_push_cpu=16 test_pop_cpu=17 test_alloc_len=12 nr_test=51200000' (200 runs): 17.758393 task-clock (msec) # 0.004 CPUs utilized ( +- 0.51% ) 5 context-switches # 0.293 K/sec ( +- 0.65% ) 0 cpu-migrations # 0.008 K/sec ( +- 17.21% ) 74 page-faults # 0.004 M/sec ( +- 0.12% ) 46128650 cycles # 2.598 GHz ( +- 0.51% ) 60810511 instructions # 1.32 insn per cycle ( +- 0.04% ) 14764914 branches # 831.433 M/sec ( +- 0.04% ) 19281 branch-misses # 0.13% of all branches ( +- 0.13% ) 4.240273854 seconds time elapsed ( +- 0.13% ) Performance counter stats for 'insmod ./page_frag_test.ko test_push_cpu=16 test_pop_cpu=17 test_alloc_len=12 nr_test=51200000 test_align=1' (200 runs): 17.348690 task-clock (msec) # 0.019 CPUs utilized ( +- 0.66% ) 5 context-switches # 0.310 K/sec ( +- 0.84% ) 0 cpu-migrations # 0.009 K/sec ( +- 16.55% ) 74 page-faults # 0.004 M/sec ( +- 0.11% ) 45065287 cycles # 2.598 GHz ( +- 0.66% ) 60755389 instructions # 1.35 insn per cycle ( +- 0.05% ) 14747865 branches # 850.085 M/sec ( +- 0.05% ) 19272 branch-misses # 0.13% of all branches ( +- 0.13% ) 0.935251375 seconds time elapsed ( +- 0.07% ) Performance counter stats for 'taskset -c 0 head -c 20G /dev/zero' (200 runs): 16626.042731 task-clock (msec) # 0.607 CPUs utilized ( +- 0.03% ) 3291020 context-switches # 0.198 M/sec ( +- 0.05% ) 1 cpu-migrations # 0.000 K/sec ( +- 0.50% ) 85 page-faults # 0.005 K/sec ( +- 0.16% ) 30581044838 cycles # 1.839 GHz ( +- 0.05% ) 34962744631 instructions # 1.14 insn per cycle ( +- 0.01% ) 6483883671 branches # 389.984 M/sec ( +- 0.02% ) 99624551 branch-misses # 1.54% of all branches ( +- 0.17% ) 27.370305077 seconds time elapsed ( +- 0.01% ) *Before* this patchset: Performance counter stats for 'insmod ./page_frag_test.ko test_push_cpu=16 test_pop_cpu=17 test_alloc_len=12 nr_test=51200000' (200 runs): 21.587934 task-clock (msec) # 0.005 CPUs utilized ( +- 0.72% ) 6 context-switches # 0.281 K/sec ( +- 0.28% ) 1 cpu-migrations # 0.047 K/sec ( +- 0.50% ) 73 page-faults # 0.003 M/sec ( +- 0.12% ) 56080697 cycles # 2.598 GHz ( +- 0.72% ) 61605150 instructions # 1.10 insn per cycle ( +- 0.05% ) 14950196 branches # 692.526 M/sec ( +- 0.05% ) 19410 branch-misses # 0.13% of all branches ( +- 0.18% ) 4.603530546 seconds time elapsed ( +- 0.11% ) Performance counter stats for 'insmod ./page_frag_test.ko test_push_cpu=16 test_pop_cpu=17 test_alloc_len=12 nr_test=51200000 test_align=1' (200 runs): 20.988297 task-clock (msec) # 0.006 CPUs utilized ( +- 0.81% ) 7 context-switches # 0.316 K/sec ( +- 0.54% ) 1 cpu-migrations # 0.048 K/sec ( +- 0.70% ) 73 page-faults # 0.003 M/sec ( +- 0.11% ) 54512166 cycles # 2.597 GHz ( +- 0.81% ) 61440941 instructions # 1.13 insn per cycle ( +- 0.08% ) 14906043 branches # 710.207 M/sec ( +- 0.08% ) 19927 branch-misses # 0.13% of all branches ( +- 0.17% ) 3.438041238 seconds time elapsed ( +- 1.11% ) Performance counter stats for 'taskset -c 0 head -c 20G /dev/zero' (200 runs): 17364.040855 task-clock (msec) # 0.624 CPUs utilized ( +- 0.02% ) 3340375 context-switches # 0.192 M/sec ( +- 0.06% ) 1 cpu-migrations # 0.000 K/sec 85 page-faults # 0.005 K/sec ( +- 0.15% ) 32077623335 cycles # 1.847 GHz ( +- 0.03% ) 35121047596 instructions # 1.09 insn per cycle ( +- 0.01% ) 6519872824 branches # 375.481 M/sec ( +- 0.02% ) 101877022 branch-misses # 1.56% of all branches ( +- 0.14% ) 27.842745343 seconds time elapsed ( +- 0.02% ) Note, ipv4-udp, ipv6-tcp and ipv6-udp is also tested with the below script: nc -u -l -k 1234 > /dev/null perf stat -r 4 -- head -c 51200000000 /dev/zero | nc -N -u 127.0.0.1 1234 nc -l6 -k 1234 > /dev/null perf stat -r 4 -- head -c 51200000000 /dev/zero | nc -N ::1 1234 nc -l6 -k -u 1234 > /dev/null perf stat -r 4 -- head -c 51200000000 /dev/zero | nc -u -N ::1 1234 CC: Alexander Duyck <alexander.duyck@gmail.com> CC: Shuah Khan <skhan@linuxfoundation.org> 1. https://lore.kernel.org/all/20241028115343.3405838-1-linyunsheng@huawei.com/ 2. https://lore.kernel.org/all/20240228093013.8263-1-linyunsheng@huawei.com/ RFC: 1. CC Andrew and MM ML explicitly. 2. Split into two parts according to the discussion in v22, and this is the part-2. 3. Split 'introduce new API' patch to more patches to make more reviewable and easier to discuss. Yunsheng Lin (10): mm: page_frag: some minor refactoring before adding new API net: rename skb_copy_to_page_nocache() helper mm: page_frag: update documentation for page_frag mm: page_frag: introduce page_frag_alloc_abort() related API mm: page_frag: introduce refill prepare & commit API mm: page_frag: introduce alloc_refill prepare & commit API mm: page_frag: introduce probe related API mm: page_frag: add testing for the newly added API net: replace page_frag with page_frag_cache mm: page_frag: add an entry in MAINTAINERS for page_frag Documentation/mm/page_frags.rst | 207 ++++++++++- MAINTAINERS | 12 + .../chelsio/inline_crypto/chtls/chtls.h | 3 - .../chelsio/inline_crypto/chtls/chtls_io.c | 101 ++---- .../chelsio/inline_crypto/chtls/chtls_main.c | 3 - drivers/net/tun.c | 47 ++- include/linux/page_frag_cache.h | 330 +++++++++++++++++- include/linux/sched.h | 2 +- include/net/sock.h | 30 +- kernel/exit.c | 3 +- kernel/fork.c | 3 +- mm/page_frag_cache.c | 108 +++++- net/core/skbuff.c | 58 +-- net/core/skmsg.c | 12 +- net/core/sock.c | 32 +- net/ipv4/ip_output.c | 28 +- net/ipv4/tcp.c | 26 +- net/ipv4/tcp_output.c | 25 +- net/ipv6/ip6_output.c | 28 +- net/kcm/kcmsock.c | 21 +- net/mptcp/protocol.c | 47 ++- net/tls/tls_device.c | 100 ++++-- .../selftests/mm/page_frag/page_frag_test.c | 76 +++- tools/testing/selftests/mm/run_vmtests.sh | 4 + tools/testing/selftests/mm/test_page_frag.sh | 27 ++ 25 files changed, 1045 insertions(+), 288 deletions(-)