Premday Process Pressurizer

New stressors

• dentrycache - negative dentries dentry cache stressor
• epollmany - many nested epoll file descriptors stressor
• fp-subnormal - float/double/long double subnormal stressor
• hugepage - huge page merging and splitting stressor
• spec-rollback - speculation branch prediction rollback stressor

New options

• --bad-ioctl-alldev - force exercising all devices (bad-ioctl stressor)
• --branch-jumps - specify number of branches to perform (branch stressor)
• --cache-badpage - cache flush on an unmapped page (cache stressor)
• --copy-file-io-bytes - specify copy-file-range I/O copy size (copy-file stressor)
• --dentrystat - periodically shows the directory entry cache (global option)
• --dentry-negative - create negative dentries (dentry stressor)
• --daemon-bloat option to simulte memory usage (daemon stressor)
• --dev-alldev - option to force exercising all devices (dev stressor)
• --no-madvise-opts - disable madvise advise on mmap/munmaps (global option)
• --ovpn-tunnel - two-endpoint DCO data path (ovpn stressor)
• --pagescatter-numa - mbind pages to NUMA nodes (pagescatter stressor)
• --vm-nt - non-temporal store/load option (vm stressor)

Many thanks to the following sponsors of the project (in alphabetical order)

Bruce Underhill (Codethink)
Chris Wayne
Gilbert Morgan
ELISA https://elisa.tech - Platinum sponsor
Premday https://premday.org - Platinum sponsor (NEW)

Sponsorship link: https://github.com/sponsors/ColinIanKing

Notable bug fixes

• stress-sem-sysv: --verify "corrupted bogo-ops counter" from concurrent counter updates in forked children - #657

• Makefile: misleading 'readelf' message and removed OBJDUMP variable - #656

• --fp-misc: bogus values in 'fail:' messages and typo in help text - #645

• --far-branch: memory mapped file needs x-permission (at least) on Cygwin - #644

• Possible missed MSG_NOSIGNAL in stress-fd-race - #643

• --exec: fails if 'program_invocation_name' is used and the program has been found in - #642

Detailed Changelog

Author: Benjamin Leggett

• core-cpu: enable AVX-512 if the CPU actually has it, not by CPU model assumption

Author: Christian Franke christian.franke@t-online.de

• Makefile: avoid misleading message 'git: No such file or directory'
• github workflows: ci-builds: change FreeBSD build from cross to native
• github workflows: ci-build: update GitHub actions from v4 to v7

Author: Gianmarco De Gregori

• stress-ovpn: drive the remaining peer-delete reasons
• stress-ovpn: exercise the tunnel data path over IPv6 as well
• stress-ovpn: reap each tunnel endpoint with a deadline of its own
• stress-ovpn: tell the cycle failure reasons apart
• stress-ovpn: work the peer table from a second process
• stress-ovpn: let a share of cycles lose the tunnel
• stress-ovpn: churn the peer table while the tunnel carries traffic
• stress-ovpn: report the kernel's own per-peer byte counters
• stress-ovpn: run the tunnel over the DCO TCP transport too
• stress-ovpn: add --ovpn-tunnel, a two-endpoint DCO data path
• stress-ovpn: bound the wait for an rtnetlink reply
• stress-ovpn: gate the stressor on the ovpn uapi, not on the header
• stress-ovpn: fix wrong entries in the exercises table

Author: Zhaolong Zhang

• stress-unlink: fix fd leak on hard link paths

Author: Colin Ian King

• stress-bad-altstack: remove small stack case
• stress-bad-altstack: use a stack with PROT_NONE guard pages
• stress-vma: add missing pthread_join post pthread_cancel
• stress-pseek: add missing pthread_join post pthread_cancel
• stress-hugepage: add missing pthread_join post pthread_cancel
• stress-tlb-numa: add missing pthread_join
• stress-*: fix race in shared s_pids->pid assignment
• stress-sem-sysv: fix race in shared s_pids->pid assignment
• stress-copy-file: fix memory leak on error exit path
• README.md: remove -j 10 from make example
• stress-kcmp: declare label 'again' only when it is required
• stress-xattr: improve speed of determining max xattr length
• stress-fp-subnormal: fix computation random ordering between r0 and r1
• stress-fp-subnormal: use DBL consts when long double size is same as double for ppc64
• stress-x86cpuid: add some non-Intel CPUID feature registers
• core-stack: voidify return from fflush()
• test/test-libacl: array aio should be acl
• core-stack: voidify return from printf
• stress-ng: voidify return from printf
• stress-fractal: voidify return from printf
• core-madvise: voidify return from fprintf
• core-parse-opts: voidify return from fprintf
• core-resctrl: voidify return from fprintf
• stress-ng: voidify return from fprintf
• stress-plugin: voidify return from fprintf
• Revert "stress-insertionsort: unroll search loop"
• core-madvise: make qsort string compare function static, use shim_strcmp
• stress-funcret: use shim wrapped math functions
• stress-pagescatter: check for HAVE_MPROTECT if mprotect() is being called
• core-mmap: check for HAVE_MADVISE if madvise() is being called
• stress-sigsegv: Fix typo, NetNBSD -> NetBSD
• stress-sigstop: add build time check for SA_SIGINFO
• stress-daemon: add --daemon-bloat option to simulte memory usage
• stress-copy-file: add --copy-file-io-bytes option
• core-madvise: add --no-madvise-opts option
• stress-branch: initialize branch_jmps to zero
• stress-fp-subnormal: use DBL consts when long double size is same as double for ppc
• stress-fp-subnormal: use DBL consts when long double size is same as double
• stress-hugepage: don't use massive pages for 32 bit systems
• stress-cachehammer: add missing const on pointer cast
• Makefile: fix misleading readelf message and removed OBJDUMP variable
• stress-sysfs: rename os_release to linux_release
• stress-ovpn: add build time check for HAVE_ATOMIC_STORE_N
• stress-fp-subnormal: add new stressor to exercise floating point subnormals
• stress-fp-misc: fix short help typo: "fp_misc" -> "fp-misc"
• Manual: minor typesetting improvements
• stress-af-alg-defconfigs: add more crypto configs from Linux 7.2
• Manual: add note about UDP-Lite being removed from Linux 7.1
• stress-clone: add CLONE_AUTOREAP clone flag
• Manual: add more explanation to the --agrressive option
• bash-completion: add --branch-jumps
• stress-bad-ioctl: remove division from buf_page1 calculation
• Manual: Fix missing .TQ in dentrycache title
• stress-branch: add --branch-jumps option and double branch targets
• stress-bad-ioctl: break ioctl rd and wr into to functions
• stress-ng: add hotplug feature flag
• stress-cgroup: read and write back numeric cgroup file values
• stress-cgroup: read cgroup files from directory contents
• stress-dentry: break variable declarations into two lines
• stress-dev: add --dev-alldev option to exercise all devices
• stress-bad-iocl: add --bad-ioctl-alldev option to exercise all devices
• stress-bad-ioctl: improve per-ioctl timeouts
• stress-bad-ioctl: use random mask on random ioctl commands
• stress-bitops: fix log2(0) case
• stress-cpu: add various constifications
• stress-copy-file: make wr_size const
• stress-cachehammer: add some variable constifiations
• stress-binderfs: break variables into multiple lines
• stress-bad-ioctl: break variables into multiple lines
• stress-atomic: minor code clean up
• stress-af-alg: break up declarations across lines
• stress-acl: break setacl, getacl to separate lines
• stress-bitops: use builtin to generate optimal log2(n)
• stress-strnum: use shim_strncmp instead of vanially strncmp
• core-builtin: add and use built in shim wrapper for strcspn
• stress-insertionsort: unroll search loop
• stress-fibsearch: unroll ininitial loop
• stress-tree: unroll btree data copying loops
• stress-tree: add RESTRICT hints to btree func args
• stress-tree: change order of nodes and values in btree
• all: fix a handful of typos and spelling mistakes
• stress-zlib: replace 32 bit math with 16 bit for ascii digits generator
• stress-uprobe: fold nested if statements into one if statement
• core-parse-opts: remove extraneous space in error message
• core-cpu-cache: replace " with ' in error message
• core-affinity: fix grammar (missing ,) in error message
• core-builtin: add and use built in shim wrapper for strrchr
• core-builtin: add and use built in shim wrapper for strlen
• core-builtin: add and use built in shim wrapper for strchr
• stress-fp: unroll some smaller loops, improves performance
• core-builtin: add and use built in shim wrapper for strstr
• core-builtin: add and use built in shim wrappers for strcmp and strncmp
• Makefile.config: add build-time detection for builtin strcmp and strcmp
• core-ftrace: optimize ftrace parsing
• stress-chroot: fix failure return variable ret defaults
• stress-bubblesort: let compiler select number of loops to unroll
• stress-bad-altstack: exercise illegal last page as stack address
• stress-sigpipe: rework nested if statements into 1 if statement
• core-helper: replace stress_redo_fork with stress_retry_fork
• stress-vm: Fix spelling mistake "stroes" -> "stores"
• README.md: update contributor list
• stress-signet: ensure t is initialized to 0.0 for finish exit path
• stress-mmaptorture: ensure n is initialized for mappings_unmap exit path
• stress-lockbus: initialize count and double at declaration time
• stress-opcode: fix CLOBBERED for ops_ptr for older gcc flavours
• stress-dentrycache: use shim_strlcat instead of strlcat
• stress-*: clean up messages, use '%s' for filenames, make messages more consistent
• stress-shm: make child always send a termination message on return
• stress-shm: add more pipe related information in read errors
• stress-cgroup: add more information on why fsopen failed
• Manual: clean up some stressor titles
• Makefile: don't echo LDFLAGS, it's not useful
• Makefile: add duplicated all: target
• Makefile: replace MACHINE with ARCH, remove Makefile.machine
• stress-atomic: fix incorrect 2nd arg of atomic_store_n
• stress-hugepage: use per-arch allocation sizes for best match for THP
• stress-*: remove hot-package flag from stressors that are not so hot
• stress-pagescatter: show free memory resources on mmap failure
• stress-spec-rollback: show free memory resources on mmap failure
• core-memory: return 0 when memory info is correctly fetched
• stress-hugepage: show free memory resources on mmap failure
• test/test-atomic_load_n: ensure val is read
• stess-vm: remove redundant initialization of ptr
• test/test-atomic_store_n: fix incorrect 2nd arg of test call
• stress-dentrycache: stress_dentrycache_stats_max: make arg d1 const
• stress-ng: fix pause option, actually get the setting
• README.md: update contributor list
• stress-hugepage: optimize method offset functions
• stress-hugepage: minor code clean ups
• stress-hugepage: add --hugepage-method option to select pages to split on
• stress-hugepage: fix typos in short help
• stress-spec-rollback: clean up pedantic build warning
• bash-completion: add missing completion strings
• stress-dentrycache: add short help for dentrycache-method option
• core-opts: remove extraneous newline
• stress-hugepage: add more feature flags
• stress-hugepage: clean up initialization options
• stress-hugepage: add a huge page merging and splitting stressor
• stress-epollmany: fix short help
• stress-dentrycache; use shim_getxattr instead of getxattr
• stress-epollmany: many nested epoll file descriptor stressor
• CITATIONS.md: add another citation reference
• stress-spec-rollback: fix up feature flags
• stress-led: unconstify token
• stress-spec-rollback: add new speculation branch predicition rollback stressor
• core-mwc: add stress_mwc128 for uint128 types, refactor code
• stress-dentrycache: rework error return for open accesses
• stress-rotate: remove loop unrolling
• stress-ng: fix jobfile timeout handling
• Manual: add missing SIGSEGV in rlimit stressor description
• stress-regs: add bitflip for x86 mmx and sse registers
• Manual: Replace "once" with "when" to clarify actions
• Manual: update number of branches taken for --goto stressor
• stress-dentrycache: add ENOENT error verification
• stress-dentrycache: periodically get latest maximum dentry stats
• stress-dentrycache: fix typo "allocted" -> "allocated"
• Revert "stress-dentrycache: remove unncessary yield points"
• core-vmstat: add --dentrystat option
• stress-ng: use relaxed lock acquire on metrics find
• stress-dentrycache: remove unncessary yield points
• core-filesystem: improve stress_fs_dentry_state_get to get all fields
• stress-dentycache: move count increment after mask check
• stress-dentrycache: don't use hex chars, use first 16 alphabet letters
• core-filesystem: move dentry-state reading into core-filesystem
• stress-dentrycache: use getxattr to access a negative dentry
• stress-dentrycache: exercise dentry cache using negative dentries
• Makefile: fix typo "built" -> "build"
• stress-quota: typedef the struct shim_nextdqblk_t
• stress-link: remove two empty lines
• stress-l1cache: unconstify val, it's modified in stress_l1cache_ln2
• stress-goto: double goto targets, doubles branch misses
• stress-dir: add negative dentries access to directory
• core-shim: simplify the shim_unvolatile_ptr implementation
• stress-bubblesort: minor variable re-ordering optimization
• core-shin: simplify the shim_unconstify_ptr implementation
• stress-affinity: make parent change child cpu affinity in pin mode
• stress-xattr: exercise large/small xattr size transitions
• stress-xattr: bail out of xattr creation loop when ENOSPC is reached
• Manual: add sporsor link
• stress-cache: ensure n_flags is initialized
• stress-atomic: account for unimplemented atomic ops
• core-mmap: constify various function arguments
• core-limit: stress_limit_set: constify argument resource
• core-helper: update prototype stress_log2
• core-ignite-cpu: constify argument in static helper function
• core-ftrace: constify arguments in static helper functions
• core-helper: stress_log2: constify arguement n
• core-helper: stress_uint64_to_str: constify arguements
• stress-pagescatter: fix end pointer calculation
• core-ops: add empty lines between different stressor options
• stress-cache: add --cache-badpage option to cache flush on a bad page
• core-mmap: replace division with shift
• stress-pagescatter: constify n
• stress-cache: remove space in OPT_cache_clwb field
• stress-cache: perform bad page cache flushing less frequently
• core-shim: improve cases covered for shim_cacheflush
• Manual: update memthrash copy128 and copy128nt descriptions
• stress-pagescatter: add register hint on pointer ptr
• stress-memrate: update bogo-ops on each memrate method invocation
• core-builtin: remove duplicate shim_lgammal, improve lgammal and tgammal
• stress-vm: add wrappers for systems w/o stress_nt_{store|load} helpers
• stress-timermix: fix GNU/HURD build failure
• CITATIONS.md: add two more references
• stress-fp-misc: fix error message values for infinite and zero fpclassify calls
• stress-fp-misc: fix typo in fp-misc-ops short help
• Makefile: add Intel icx compiler alternative code for a range of CPUs
• stress-dentry: add --dentry-negative option to create negative dentries
• stress-dentry: add metrics on negative and used dentries
• stress-opcode: add more x86 prefix opcodes
• stress-vm: add --vm-nt non-temporal store/load option
• stress-atomic: add load_n and store_n atomic operations
• stress-spinmem: use load_n and store_n atomics
• stress-pagescatter: fix { } on if statement
• stress-ng: rework clobbering macros
• stress-far-branch: add missing S_IXUSR on mmap'd file open
• stress-fd-race: use MSG_NOSIGNAL for sendmsg where possible
• stress-pagescatter: add --pagescatter-numa option
• stress-memthrash: drop copy128nt back to copy128 if non-temporal load/stores not available
• stress-memthrash: add a non-temporal load/store copy128 variant
• stress-ng: use stressor_info_t instead of struct stressor_info
• core-lock: use stress_lock_t instead of struct stress_lock
• core-helper: fix typo in function prototype args
• stress-ng: minor stress_memory_info code clean-ups
• core-helper: stress_load_average_get: pass load average as a type
• core-cpu-freq: pass cpu freq data in a stress_cpu_freq_get_t type
• core-helper: use executable name /proc/*/exe for Cywgin
• core-helper: check for invalid filename
• stress-exec: use a more meaningful file name in the error messages
• debian/control: linux-any is required for libnl-3-dev