- Linux-kselftest-mirror - lists.linaro.org

[PATCH net-next v2 0/4] netdevsim: implement RX statistics using NETDEV_PCPU_STAT_DSTATS

by Breno Leitao

The netdevsim driver previously lacked RX statistics support, which prevented its use with the GenerateTraffic() test framework, as this framework verifies traffic flow by checking RX byte counts. This patch migrates netdevsim from its custom statistics collection to the NETDEV_PCPU_STAT_DSTATS framework, as suggested by Jakub. This change not only standardizes the statistics handling but also adds the necessary RX statistics support required by the test framework. Signed-off-by: Breno Leitao <leitao(a)debian.org> --- Changes in v2: - Changed the RX collection place from nsim_napi_rx() to nsim_rcv (Joe Damato) - Collect RX dropped packets statistic in nsim_queue_free() (Jakub) - Added a helper in dstat to add values to RX dropped packets - Link to v1: https://lore.kernel.org/r/20250611-netdevsim_stat-v1-0-c11b657d96bf@debian.… --- Breno Leitao (4): netdevsim: migrate to dstats stats collection netdevsim: collect statistics at RX side net: add dev_dstats_rx_dropped_add() helper netdevsim: account dropped packet length in stats on queue free drivers/net/netdevsim/netdev.c | 48 ++++++++++++++++----------------------- drivers/net/netdevsim/netdevsim.h | 5 ---- include/linux/netdevice.h | 10 ++++++++ 3 files changed, 29 insertions(+), 34 deletions(-) --- base-commit: 6d4e01d29d87356924f1521ca6df7a364e948f13 change-id: 20250610-netdevsim_stat-95995921e03e Best regards, -- Breno Leitao <leitao(a)debian.org>

3 months

2
7
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[PATCH v9 iproute2-next 0/1] DUALPI2 iproute2 patch

by chia-yu.chang＠nokia-bell-labs.com

From: Chia-Yu Chang <chia-yu.chang(a)nokia-bell-labs.com> Hello, Please find DUALPI2 iproute2 patch v9. For more details of DualPI2, please refer IETF RFC9332 (https://datatracker.ietf.org/doc/html/rfc9332). Best Regards, Chia-Yu --- v9 (13-Jun-25) - Fix space issue and typos (ALOK TIWARI <alok.a.tiwari(a)oracle.com>) - Change 'rtt_typical' to 'typical_rtt' in tc/q_dualpi2.c (ALOK TIWARI <alok.a.tiwari(a)oracle.com>) - Add the num of enum used by DualPI2 in pkt_sched.h v8 (09-May-25) - Update pkt_sched.h with the one in nex-next - Correct a typo in the comment within pkt_sched.h (ALOK TIWARI <alok.a.tiwari(a)oracle.com>) - Update manual content in man/man8/tc-dualpi2.8 (ALOK TIWARI <alok.a.tiwari(a)oracle.com>) - Update tc/q_dualpi2.c to fix missing blank lines and add missing case (ALOK TIWARI <alok.a.tiwari(a)oracle.com>) v7 (05-May-25) - Align pkt_sched.h with the v14 version of net-next due to spec modification in tc.yaml - Reorganize dualpi2_print_opt() to match the order in tc.yaml - Remove credit-queue in PRINT_JSON v6 (26-Apr-25) - Update JSON file output due to spec modification in tc.yaml of net-next v5 (25-Mar-25) - Use matches() to replace current strcmp() (Stephen Hemminger <stephen(a)networkplumber.org>) - Use general parse_percent() for handling scaled percentage values (Stephen Hemminger <stephen(a)networkplumber.org>) - Add print function for JSON of dualpi2 stats (Stephen Hemminger <stephen(a)networkplumber.org>) v4 (16-Mar-25) - Add min_qlen_step to the dualpi2 attribute as the minimum queue length in number of packets in the L-queue to start step marking. v3 (21-Feb-25) - Add memlimit to the dualpi2 attribute, and add memory_used, max_memory_used, and memory_limit in dualpi2 stats (Dave Taht <dave.taht(a)gmail.com>) - Update the manual to align with the latest implementation and clarify the queue naming and default unit - Use common "get_scaled_alpha_beta" and clean print_opt for Dualpi2 v2 (23-Oct-24) - Rename get_float in dualpi2 to get_float_min_max in utils.c - Move get_float from iplink_can.c in utils.c (Stephen Hemminger <stephen(a)networkplumber.org>) - Add print function for JSON of dualpi2 (Stephen Hemminger <stephen(a)networkplumber.org>) --- Chia-Yu Chang (1): tc: add dualpi2 scheduler module bash-completion/tc | 11 +- include/uapi/linux/pkt_sched.h | 70 ++++- include/utils.h | 2 + ip/iplink_can.c | 14 - lib/utils.c | 30 ++ man/man8/tc-dualpi2.8 | 249 +++++++++++++++ tc/Makefile | 1 + tc/q_dualpi2.c | 534 +++++++++++++++++++++++++++++++++ 8 files changed, 895 insertions(+), 16 deletions(-) create mode 100644 man/man8/tc-dualpi2.8 create mode 100644 tc/q_dualpi2.c -- 2.34.1

3 months

1
1
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[kvm-unit-tests PATCH 1/2] riscv: Allow SBI_CONSOLE with no uart in device tree

by Jesse Taube

When CONFIG_SBI_CONSOLE is enabled and there is no uart defined in the device tree kvm-unit-tests fails to start. Only check if uart exists in device tree if SBI_CONSOLE is false. Signed-off-by: Jesse Taube <jesse(a)rivosinc.com> --- lib/riscv/io.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/riscv/io.c b/lib/riscv/io.c index fb40adb7..96a3c048 100644 --- a/lib/riscv/io.c +++ b/lib/riscv/io.c @@ -104,6 +104,7 @@ static void uart0_init_acpi(void) void io_init(void) { +#ifndef CONFIG_SBI_CONSOLE if (dt_available()) uart0_init_fdt(); else @@ -114,6 +115,7 @@ void io_init(void) "Found uart at %p, but early base is %p.\n", uart0_base, UART_EARLY_BASE); } +#endif } #ifdef CONFIG_SBI_CONSOLE -- 2.43.0

3 months

2
3
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[PATCH v2] selftests/mm: Add configs to fix testcase failure

by Dev Jain

If CONFIG_UPROBES is not set, a merge subtest fails: Failure log: 7151 12:46:54.627936 # # # RUN merge.handle_uprobe_upon_merged_vma ... 7152 12:46:54.639014 # # f /sys/bus/event_source/devices/uprobe/type 7153 12:46:54.639306 # # fopen: No such file or directory 7154 12:46:54.650451 # # # merge.c:473:handle_uprobe_upon_merged_vma:Expected read_sysfs("/sys/bus/event_source/devices/uprobe/type", &type) (1) == 0 (0) 7155 12:46:54.650730 # # # handle_uprobe_upon_merged_vma: Test terminated by assertion 7156 12:46:54.661750 # # # FAIL merge.handle_uprobe_upon_merged_vma 7157 12:46:54.662030 # # not ok 8 merge.handle_uprobe_upon_merged_vma CONFIG_UPROBES is enabled by CONFIG_UPROBE_EVENTS, which gets enabled by CONFIG_FTRACE. Therefore add these configs to selftests/mm/config so that CI systems can include this config in the kernel build. To be completely safe, add CONFIG_PROFILING too, to enable the dependency chain PROFILING -> PERF_EVENTS -> UPROBE_EVENTS -> UPROBES. Fixes: efe99fabeb11b ("selftests/mm: add test about uprobe pte be orphan during vma merge") Reported-by: Aishwarya <aishwarya.tcv(a)arm.com> Closes: https://lore.kernel.org/all/20250610103729.72440-1-aishwarya.tcv@arm.com/ Tested-by: Aishwarya TCV <aishwarya.tcv(a)arm.com> Tested-by : Donet Tom <donettom(a)linux.ibm.com> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Signed-off-by: Dev Jain <dev.jain(a)arm.com> --- v1->v2: - Add CONFIG_UPROBES (Mark Brown) - Add CONFIG_PROFILING (Lorenzo) tools/testing/selftests/mm/config | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/mm/config b/tools/testing/selftests/mm/config index a28baa536332..deba93379c80 100644 --- a/tools/testing/selftests/mm/config +++ b/tools/testing/selftests/mm/config @@ -8,3 +8,6 @@ CONFIG_GUP_TEST=y CONFIG_TRANSPARENT_HUGEPAGE=y CONFIG_MEM_SOFT_DIRTY=y CONFIG_ANON_VMA_NAME=y +CONFIG_FTRACE=y +CONFIG_PROFILING=y +CONFIG_UPROBES=y -- 2.30.2

3 months

5
4
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[PATCH] selftest/mm: Skip if fallocate() is unsupported in gup_longterm

by Mark Brown

Currently gup_longterm assumes that filesystems support fallocate() and uses that to allocate space in files, however this is an optional feature and is in particular not implemented by NFSv3 which is commonly used in CI systems leading to spurious failures. Check for lack of support and report a skip instead for that case. Signed-off-by: Mark Brown <broonie(a)kernel.org> --- tools/testing/selftests/mm/gup_longterm.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c index 8a97ac5176a4..0e99494268ed 100644 --- a/tools/testing/selftests/mm/gup_longterm.c +++ b/tools/testing/selftests/mm/gup_longterm.c @@ -114,7 +114,15 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared) } if (fallocate(fd, 0, 0, size)) { - if (size == pagesize) { + /* + * Some filesystems (eg, NFSv3) don't support + * fallocate(), report this as a skip rather than a + * test failure. + */ + if (errno == EOPNOTSUPP) { + ksft_print_msg("fallocate() not supported by filesystem\n"); + result = KSFT_SKIP; + } else if (size == pagesize) { ksft_print_msg("fallocate() failed (%s)\n", strerror(errno)); result = KSFT_FAIL; } else { --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250610-selftest-mm-gup-longterm-fallocate-nfs-21ef54627ef2 Best regards, -- Mark Brown <broonie(a)kernel.org>

3 months

1
0
0 0

[PATCH net-next v2 0/7] netpoll: Untangle netconsole and netpoll

by Breno Leitao

Initially netpoll and netconsole were created together, and some functions are in the wrong file. Seperate netconsole-only functions in netconsole, avoiding exports. 1. Expose netpoll logging macros in the public header to enable consistent log formatting across netpoll consumers. 2. Relocate netconsole-specific functions from netpoll to the netconsole module where they are actually used, reducing unnecessary coupling. 3. Remove unnecessary function exports 4. Rename netpoll parsing functions in netconsole to better reflect their specific usage. 5. Create a test to check that cmdline works fine. This was in my todo list since [1], this was a good time to add it here to make sure this patchset doesn't regress. PS: The code was split in a way that it is easy to review. When copying the functions from netpoll to netconsole, I do not change than other than adding `static`. This will make checkpatch unhappy, but, further patches will address the issues. It is done this way to make it easy for reviewers. Link: https://lore.kernel.org/netdev/Z36TlACdNMwFD7wv@dev-ushankar.dev.purestorag… [1] Signed-off-by: Breno Leitao <leitao(a)debian.org> --- Changes in v2: - No change in the code. Just rebased the patches onto netnext/main - Link to v1: https://lore.kernel.org/r/20250610-rework-v1-0-7cfde283f246@debian.org --- Breno Leitao (7): netpoll: remove __netpoll_cleanup from exported API netpoll: expose netpoll logging macros in public header netpoll: relocate netconsole-specific functions to netconsole module netpoll: move netpoll_print_options to netconsole netconsole: rename functions to better reflect their purpose netconsole: improve code style in parser function selftest: netconsole: add test for cmdline configuration drivers/net/netconsole.c | 137 ++++++++++++++++++++- include/linux/netpoll.h | 10 +- net/core/netpoll.c | 136 +------------------- tools/testing/selftests/drivers/net/Makefile | 1 + .../selftests/drivers/net/lib/sh/lib_netcons.sh | 39 +++++- .../selftests/drivers/net/netcons_cmdline.sh | 52 ++++++++ 6 files changed, 228 insertions(+), 147 deletions(-) --- base-commit: 0097c4195b1d0ca57d15979626c769c74747b5a0 change-id: 20250603-rework-c175cad8d22e Best regards, -- Breno Leitao <leitao(a)debian.org>

3 months

2
9
0 0

[PATCH v2 1/2] selftests: khugepaged: fix the shmem collapse failure

by Baolin Wang

When running the khugepaged selftest for shmem (./khugepaged all:shmem), I encountered the following test failures: " Run test: collapse_full (khugepaged:shmem) Collapse multiple fully populated PTE table.... Fail ... Run test: collapse_single_pte_entry (khugepaged:shmem) Collapse PTE table with single PTE entry present.... Fail ... Run test: collapse_full_of_compound (khugepaged:shmem) Allocate huge page... OK Split huge page leaving single PTE page table full of compound pages... OK Collapse PTE table full of compound pages.... Fail " The reason for the failure is that, it will set MADV_NOHUGEPAGE to prevent khugepaged from continuing to scan shmem VMA after khugepaged finishes scanning in the wait_for_scan() function. Moreover, shmem requires a refault to establish PMD mappings. However, after commit 2b0f922323cc ("mm: don't install PMD mappings when THPs are disabled by the hw/process/vma"), PMD mappings are prevented if the VMA is set with MADV_NOHUGEPAGE flag, so shmem cannot establish PMD mappings during refault. One way to fix this issue is to move the MADV_NOHUGEPAGE setting after the shmem refault. After shmem refault and check huge, the test case will unmap the shmem immediately. So it seems unnecessary to set the MADV_NOHUGEPAGE. Then we can simply drop the MADV_NOHUGEPAGE setting, and all khugepaged test cases passed. Fixes: 2b0f922323cc ("mm: don't install PMD mappings when THPs are disabled by the hw/process/vma") Reviewed-by: Zi Yan <ziy(a)nvidia.com> Signed-off-by: Baolin Wang <baolin.wang(a)linux.alibaba.com> --- Changes from v1: - Add reviewed tag from Zi. Thanks. - Drop the MADV_NOHUGEPAGE setting, per David. --- tools/testing/selftests/mm/khugepaged.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/tools/testing/selftests/mm/khugepaged.c b/tools/testing/selftests/mm/khugepaged.c index 8a4d34cce36b..4341ce6b3b38 100644 --- a/tools/testing/selftests/mm/khugepaged.c +++ b/tools/testing/selftests/mm/khugepaged.c @@ -561,8 +561,6 @@ static bool wait_for_scan(const char *msg, char *p, int nr_hpages, usleep(TICK); } - madvise(p, nr_hpages * hpage_pmd_size, MADV_NOHUGEPAGE); - return timeout == -1; } -- 2.43.5

3 months

3
3
0 0

[PATCH v4 00/14] kselftest harness and nolibc compatibility

by Thomas Weißschuh

Nolibc is useful for selftests as the test programs can be very small, and compiled with just a kernel crosscompiler, without userspace support. Currently nolibc is only usable with kselftest.h, not the more convenient to use kselftest_harness.h This series provides this compatibility by removing the usage of problematic libc features from the harness. Based on nolibc/for-next. The series is meant to be merged through the nolibc tree. Signed-off-by: Thomas Weißschuh <thomas.weissschuh(a)linutronix.de> --- Changes in v4: - Drop patches for nolibc which where already applied - Preserve signatures of test functions for tests making assumptions about them drop 'selftests: harness: Always provide "self" and "variant"' add 'selftests: harness: Add "variant" and "self" to test metadata' adapt 'selftests: harness: Stop using setjmp()/longjmp()' - Validate test function signatures in harness selftest - Link to v3: https://lore.kernel.org/r/20250411-nolibc-kselftest-harness-v3-0-4d9c029589… Changes in v3: - Send patches to correct kselftest harness maintainers - Move harness selftest to dedicated directory - Add harness selftest to MAINTAINERS - Integrate harness selftest cleanup with the selftest framework - Consistently use "kselftest harness" in commit messages - Properly propagate kselftest harness failure - Link to v2: https://lore.kernel.org/r/20250407-nolibc-kselftest-harness-v2-0-f8812f76e9… Changes in v2: - Rebase unto v6.15-rc1 - Rename internal nolibc symbols - Handle edge case of waitpid(INT_MIN) == ESRCH - Fix arm configurations for final testing patch - Clean up global getopt.h variable declarations - Add Acks from Willy - Link to v1: https://lore.kernel.org/r/20250304-nolibc-kselftest-harness-v1-0-adca7cd231… --- Thomas Weißschuh (14): selftests: harness: Add kselftest harness selftest selftests: harness: Use C89 comment style selftests: harness: Ignore unused variant argument warning selftests: harness: Mark functions without prototypes static selftests: harness: Remove inline qualifier for wrappers selftests: harness: Remove dependency on libatomic selftests: harness: Implement test timeouts through pidfd selftests: harness: Don't set setup_completed for fixtureless tests selftests: harness: Move teardown conditional into test metadata selftests: harness: Add teardown callback to test metadata selftests: harness: Add "variant" and "self" to test metadata selftests: harness: Stop using setjmp()/longjmp() selftests: harness: Guard includes on nolibc HACK: selftests/nolibc: demonstrate usage of the kselftest harness MAINTAINERS | 1 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/kselftest_harness.h | 175 +- .../testing/selftests/kselftest_harness/.gitignore | 2 + tools/testing/selftests/kselftest_harness/Makefile | 7 + .../selftests/kselftest_harness/harness-selftest.c | 138 ++ .../kselftest_harness/harness-selftest.expected | 64 + .../kselftest_harness/harness-selftest.sh | 13 + tools/testing/selftests/nolibc/Makefile | 15 +- tools/testing/selftests/nolibc/harness-selftest.c | 1 + tools/testing/selftests/nolibc/nolibc-test.c | 1715 +------------------- tools/testing/selftests/nolibc/run-tests.sh | 2 +- 12 files changed, 313 insertions(+), 1821 deletions(-) --- base-commit: 2051d3b830c0889ae55e37e9e8ff0d43a4acd482 change-id: 20250130-nolibc-kselftest-harness-8b2c8cac43bf Best regards, -- Thomas Weißschuh <thomas.weissschuh(a)linutronix.de>

3 months

6
45
0 0

[PATCH v3 10/10] selftests/sched_ext: Add test for sched_ext dl_server

by Joel Fernandes

From: Andrea Righi <arighi(a)nvidia.com> Add a selftest to validate the correct behavior of the deadline server for the ext_sched_class. [ Joel: Replaced occurences of CFS in the test with EXT. ] Signed-off-by: Joel Fernandes <joelagnelf(a)nvidia.com> Signed-off-by: Andrea Righi <arighi(a)nvidia.com> --- tools/testing/selftests/sched_ext/Makefile | 1 + .../selftests/sched_ext/rt_stall.bpf.c | 23 ++ tools/testing/selftests/sched_ext/rt_stall.c | 213 ++++++++++++++++++ 3 files changed, 237 insertions(+) create mode 100644 tools/testing/selftests/sched_ext/rt_stall.bpf.c create mode 100644 tools/testing/selftests/sched_ext/rt_stall.c diff --git a/tools/testing/selftests/sched_ext/Makefile b/tools/testing/selftests/sched_ext/Makefile index f4531327b8e7..dcc803eeab39 100644 --- a/tools/testing/selftests/sched_ext/Makefile +++ b/tools/testing/selftests/sched_ext/Makefile @@ -181,6 +181,7 @@ auto-test-targets := \ select_cpu_dispatch_bad_dsq \ select_cpu_dispatch_dbl_dsp \ select_cpu_vtime \ + rt_stall \ test_example \ testcase-targets := $(addsuffix .o,$(addprefix $(SCXOBJ_DIR)/,$(auto-test-targets))) diff --git a/tools/testing/selftests/sched_ext/rt_stall.bpf.c b/tools/testing/selftests/sched_ext/rt_stall.bpf.c new file mode 100644 index 000000000000..80086779dd1e --- /dev/null +++ b/tools/testing/selftests/sched_ext/rt_stall.bpf.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * A scheduler that verified if RT tasks can stall SCHED_EXT tasks. + * + * Copyright (c) 2025 NVIDIA Corporation. + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +UEI_DEFINE(uei); + +void BPF_STRUCT_OPS(rt_stall_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops rt_stall_ops = { + .exit = (void *)rt_stall_exit, + .name = "rt_stall", +}; diff --git a/tools/testing/selftests/sched_ext/rt_stall.c b/tools/testing/selftests/sched_ext/rt_stall.c new file mode 100644 index 000000000000..d4cb545ebfd8 --- /dev/null +++ b/tools/testing/selftests/sched_ext/rt_stall.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2025 NVIDIA Corporation. + */ +#define _GNU_SOURCE +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <sched.h> +#include <sys/prctl.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <time.h> +#include <linux/sched.h> +#include <signal.h> +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "rt_stall.bpf.skel.h" +#include "scx_test.h" +#include "../kselftest.h" + +#define CORE_ID 0 /* CPU to pin tasks to */ +#define RUN_TIME 5 /* How long to run the test in seconds */ + +/* Simple busy-wait function for test tasks */ +static void process_func(void) +{ + while (1) { + /* Busy wait */ + for (volatile unsigned long i = 0; i < 10000000UL; i++); + } +} + +/* Set CPU affinity to a specific core */ +static void set_affinity(int cpu) +{ + cpu_set_t mask; + + CPU_ZERO(&mask); + CPU_SET(cpu, &mask); + if (sched_setaffinity(0, sizeof(mask), &mask) != 0) { + perror("sched_setaffinity"); + exit(EXIT_FAILURE); + } +} + +/* Set task scheduling policy and priority */ +static void set_sched(int policy, int priority) +{ + struct sched_param param; + + param.sched_priority = priority; + if (sched_setscheduler(0, policy, &param) != 0) { + perror("sched_setscheduler"); + exit(EXIT_FAILURE); + } +} + +/* Get process runtime from /proc/<pid>/stat */ +static float get_process_runtime(int pid) +{ + char path[256]; + FILE *file; + long utime, stime; + int fields; + + snprintf(path, sizeof(path), "/proc/%d/stat", pid); + file = fopen(path, "r"); + if (file == NULL) { + perror("Failed to open stat file"); + return -1; + } + + /* Skip the first 13 fields and read the 14th and 15th */ + fields = fscanf(file, + "%*d %*s %*c %*d %*d %*d %*d %*d %*u %*u %*u %*u %*u %lu %lu", + &utime, &stime); + fclose(file); + + if (fields != 2) { + fprintf(stderr, "Failed to read stat file\n"); + return -1; + } + + /* Calculate the total time spent in the process */ + long total_time = utime + stime; + long ticks_per_second = sysconf(_SC_CLK_TCK); + float runtime_seconds = total_time * 1.0 / ticks_per_second; + + return runtime_seconds; +} + +static enum scx_test_status setup(void **ctx) +{ + struct rt_stall *skel; + + skel = rt_stall__open(); + SCX_FAIL_IF(!skel, "Failed to open"); + SCX_ENUM_INIT(skel); + SCX_FAIL_IF(rt_stall__load(skel), "Failed to load skel"); + + *ctx = skel; + + return SCX_TEST_PASS; +} + +static bool sched_stress_test(void) +{ + float cfs_runtime, rt_runtime; + int cfs_pid, rt_pid; + float expected_min_ratio = 0.04; /* 4% */ + + ksft_print_header(); + ksft_set_plan(1); + + /* Create and set up a EXT task */ + cfs_pid = fork(); + if (cfs_pid == 0) { + set_affinity(CORE_ID); + process_func(); + exit(0); + } else if (cfs_pid < 0) { + perror("fork for EXT task"); + ksft_exit_fail(); + } + + /* Create an RT task */ + rt_pid = fork(); + if (rt_pid == 0) { + set_affinity(CORE_ID); + set_sched(SCHED_FIFO, 50); + process_func(); + exit(0); + } else if (rt_pid < 0) { + perror("fork for RT task"); + ksft_exit_fail(); + } + + /* Let the processes run for the specified time */ + sleep(RUN_TIME); + + /* Get runtime for the EXT task */ + cfs_runtime = get_process_runtime(cfs_pid); + if (cfs_runtime != -1) + ksft_print_msg("Runtime of EXT task (PID %d) is %f seconds\n", cfs_pid, cfs_runtime); + else + ksft_exit_fail_msg("Error getting runtime for EXT task (PID %d)\n", cfs_pid); + + /* Get runtime for the RT task */ + rt_runtime = get_process_runtime(rt_pid); + if (rt_runtime != -1) + ksft_print_msg("Runtime of RT task (PID %d) is %f seconds\n", rt_pid, rt_runtime); + else + ksft_exit_fail_msg("Error getting runtime for RT task (PID %d)\n", rt_pid); + + /* Kill the processes */ + kill(cfs_pid, SIGKILL); + kill(rt_pid, SIGKILL); + waitpid(cfs_pid, NULL, 0); + waitpid(rt_pid, NULL, 0); + + /* Verify that the scx task got enough runtime */ + float actual_ratio = cfs_runtime / (cfs_runtime + rt_runtime); + ksft_print_msg("EXT task got %.2f%% of total runtime\n", actual_ratio * 100); + + if (actual_ratio >= expected_min_ratio) { + ksft_test_result_pass("PASS: EXT task got more than %.2f%% of runtime\n", + expected_min_ratio * 100); + return true; + } else { + ksft_test_result_fail("FAIL: EXT task got less than %.2f%% of runtime\n", + expected_min_ratio * 100); + return false; + } +} + +static enum scx_test_status run(void *ctx) +{ + struct rt_stall *skel = ctx; + struct bpf_link *link; + bool res; + + link = bpf_map__attach_struct_ops(skel->maps.rt_stall_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + res = sched_stress_test(); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_NONE)); + bpf_link__destroy(link); + + if (!res) + ksft_exit_fail(); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct rt_stall *skel = ctx; + + rt_stall__destroy(skel); +} + +struct scx_test rt_stall = { + .name = "rt_stall", + .description = "Verify that RT tasks cannot stall SCHED_EXT tasks", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&rt_stall) -- 2.34.1

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[PATCH V5 2/2] KVM: selftests: Change MDSCR_EL1 register holding variables as uint64_t

by Anshuman Khandual

Change MDSCR_EL1 register holding local variables as uint64_t that reflects its true register width as well. Cc: Marc Zyngier <maz(a)kernel.org> Cc: Oliver Upton <oliver.upton(a)linux.dev> Cc: Joey Gouly <joey.gouly(a)arm.com> Cc: kvm(a)vger.kernel.org Cc: kvmarm(a)lists.linux.dev Cc: linux-kernel(a)vger.kernel.org Cc: linux-kselftest(a)vger.kernel.org Cc: linux-arm-kernel(a)lists.infradead.org Reviewed-by: Ada Couprie Diaz <ada.coupriediaz(a)arm.com> Signed-off-by: Anshuman Khandual <anshuman.khandual(a)arm.com> --- tools/testing/selftests/kvm/arm64/debug-exceptions.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/arm64/debug-exceptions.c b/tools/testing/selftests/kvm/arm64/debug-exceptions.c index c7fb55c9135b..e34963956fbc 100644 --- a/tools/testing/selftests/kvm/arm64/debug-exceptions.c +++ b/tools/testing/selftests/kvm/arm64/debug-exceptions.c @@ -140,7 +140,7 @@ static void enable_os_lock(void) static void enable_monitor_debug_exceptions(void) { - uint32_t mdscr; + uint64_t mdscr; asm volatile("msr daifclr, #8"); @@ -223,7 +223,7 @@ void install_hw_bp_ctx(uint8_t addr_bp, uint8_t ctx_bp, uint64_t addr, static void install_ss(void) { - uint32_t mdscr; + uint64_t mdscr; asm volatile("msr daifclr, #8"); -- 2.25.1

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