# git rev-parse -q --verify d08c407f715f651e7ea40b3a037be46dd2b11e4c^{commit} d08c407f715f651e7ea40b3a037be46dd2b11e4c already have revision, skipping fetch # git checkout -q -f -B kisskb d08c407f715f651e7ea40b3a037be46dd2b11e4c # git clean -qxdf # < git log -1 # commit d08c407f715f651e7ea40b3a037be46dd2b11e4c # Merge: 80a76c60e5f6 8ca1836769d7 # Author: Linus Torvalds # Date: Mon Mar 11 14:38:26 2024 -0700 # # Merge tag 'timers-core-2024-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip # # Pull timer updates from Thomas Gleixner: # "A large set of updates and features for timers and timekeeping: # # - The hierarchical timer pull model # # When timer wheel timers are armed they are placed into the timer # wheel of a CPU which is likely to be busy at the time of expiry. # This is done to avoid wakeups on potentially idle CPUs. # # This is wrong in several aspects: # # 1) The heuristics to select the target CPU are wrong by # definition as the chance to get the prediction right is # close to zero. # # 2) Due to #1 it is possible that timers are accumulated on # a single target CPU # # 3) The required computation in the enqueue path is just overhead # for dubious value especially under the consideration that the # vast majority of timer wheel timers are either canceled or # rearmed before they expire. # # The timer pull model avoids the above by removing the target # computation on enqueue and queueing timers always on the CPU on # which they get armed. # # This is achieved by having separate wheels for CPU pinned timers # and global timers which do not care about where they expire. # # As long as a CPU is busy it handles both the pinned and the global # timers which are queued on the CPU local timer wheels. # # When a CPU goes idle it evaluates its own timer wheels: # # - If the first expiring timer is a pinned timer, then the global # timers can be ignored as the CPU will wake up before they # expire. # # - If the first expiring timer is a global timer, then the expiry # time is propagated into the timer pull hierarchy and the CPU # makes sure to wake up for the first pinned timer. # # The timer pull hierarchy organizes CPUs in groups of eight at the # lowest level and at the next levels groups of eight groups up to # the point where no further aggregation of groups is required, i.e. # the number of levels is log8(NR_CPUS). The magic number of eight # has been established by experimention, but can be adjusted if # needed. # # In each group one busy CPU acts as the migrator. It's only one CPU # to avoid lock contention on remote timer wheels. # # The migrator CPU checks in its own timer wheel handling whether # there are other CPUs in the group which have gone idle and have # global timers to expire. If there are global timers to expire, the # migrator locks the remote CPU timer wheel and handles the expiry. # # Depending on the group level in the hierarchy this handling can # require to walk the hierarchy downwards to the CPU level. # # Special care is taken when the last CPU goes idle. At this point # the CPU is the systemwide migrator at the top of the hierarchy and # it therefore cannot delegate to the hierarchy. It needs to arm its # own timer device to expire either at the first expiring timer in # the hierarchy or at the first CPU local timer, which ever expires # first. # # This completely removes the overhead from the enqueue path, which # is e.g. for networking a true hotpath and trades it for a slightly # more complex idle path. # # This has been in development for a couple of years and the final # series has been extensively tested by various teams from silicon # vendors and ran through extensive CI. # # There have been slight performance improvements observed on network # centric workloads and an Intel team confirmed that this allows them # to power down a die completely on a mult-die socket for the first # time in a mostly idle scenario. # # There is only one outstanding ~1.5% regression on a specific # overloaded netperf test which is currently investigated, but the # rest is either positive or neutral performance wise and positive on # the power management side. # # - Fixes for the timekeeping interpolation code for cross-timestamps: # # cross-timestamps are used for PTP to get snapshots from hardware # timers and interpolated them back to clock MONOTONIC. The changes # address a few corner cases in the interpolation code which got the # math and logic wrong. # # - Simplifcation of the clocksource watchdog retry logic to # automatically adjust to handle larger systems correctly instead of # having more incomprehensible command line parameters. # # - Treewide consolidation of the VDSO data structures. # # - The usual small improvements and cleanups all over the place" # # * tag 'timers-core-2024-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (62 commits) # timer/migration: Fix quick check reporting late expiry # tick/sched: Fix build failure for CONFIG_NO_HZ_COMMON=n # vdso/datapage: Quick fix - use asm/page-def.h for ARM64 # timers: Assert no next dyntick timer look-up while CPU is offline # tick: Assume timekeeping is correctly handed over upon last offline idle call # tick: Shut down low-res tick from dying CPU # tick: Split nohz and highres features from nohz_mode # tick: Move individual bit features to debuggable mask accesses # tick: Move got_idle_tick away from common flags # tick: Assume the tick can't be stopped in NOHZ_MODE_INACTIVE mode # tick: Move broadcast cancellation up to CPUHP_AP_TICK_DYING # tick: Move tick cancellation up to CPUHP_AP_TICK_DYING # tick: Start centralizing tick related CPU hotplug operations # tick/sched: Don't clear ts::next_tick again in can_stop_idle_tick() # tick/sched: Rename tick_nohz_stop_sched_tick() to tick_nohz_full_stop_tick() # tick: Use IS_ENABLED() whenever possible # tick/sched: Remove useless oneshot ifdeffery # tick/nohz: Remove duplicate between lowres and highres handlers # tick/nohz: Remove duplicate between tick_nohz_switch_to_nohz() and tick_setup_sched_timer() # hrtimer: Select housekeeping CPU during migration # ... # < /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 d08c407f715f651e7ea40b3a037be46dd2b11e4c # make -s -j 24 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 allmodconfig # Added to kconfig CONFIG_STANDALONE=y # Added to kconfig CONFIG_KCOV=n # Added to kconfig CONFIG_GCC_PLUGINS=n # Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n # Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n # Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n # Added to kconfig CONFIG_GCC_PLUGIN_STRUCTLEAK=n # Added to kconfig CONFIG_GCC_PLUGIN_RANDSTRUCT=n # Added to kconfig CONFIG_UML_NET=n # Added to kconfig CONFIG_UML_NET_ETHERTAP=n # Added to kconfig CONFIG_UML_NET_TUNTAP=n # Added to kconfig CONFIG_UML_NET_SLIP=n # Added to kconfig CONFIG_UML_NET_DAEMON=n # Added to kconfig CONFIG_UML_NET_VDE=n # Added to kconfig CONFIG_UML_NET_MCAST=n # Added to kconfig CONFIG_UML_NET_PCAP=n # Added to kconfig CONFIG_UML_NET_SLIRP=n # Added to kconfig CONFIG_GCOV_KERNEL=n # Added to kconfig CONFIG_DEBUG_INFO_BTF=n # Added to kconfig CONFIG_BPF_PRELOAD=n # Added to kconfig CONFIG_SPI_STM32_QSPI=n # < make -s -j 24 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 help # make -s -j 24 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig .config:14167:warning: override: reassigning to symbol GCC_PLUGIN_LATENT_ENTROPY .config:14171:warning: override: reassigning to symbol UML_NET_ETHERTAP .config:14173:warning: override: reassigning to symbol UML_NET_SLIP .config:14178:warning: override: reassigning to symbol UML_NET_SLIRP # make -s -j 24 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 /kisskb/src/arch/x86/um/user-offsets.c:17:6: warning: no previous prototype for ‘foo’ [-Wmissing-prototypes] 17 | void foo(void) | ^~~ In file included from /kisskb/src/arch/um/kernel/asm-offsets.c:1: /kisskb/src/arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: error: no previous prototype for ‘foo’ [-Werror=missing-prototypes] 9 | void foo(void) | ^~~ cc1: all warnings being treated as errors make[3]: *** [/kisskb/src/scripts/Makefile.build:116: arch/um/kernel/asm-offsets.s] Error 1 make[2]: *** [/kisskb/src/Makefile:1199: prepare0] Error 2 make[1]: *** [/kisskb/src/Makefile:240: __sub-make] Error 2 make: *** [Makefile:240: __sub-make] Error 2 Command 'make -s -j 24 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 ' returned non-zero exit status 2. # rm -rf /kisskb/build/linus_allmodconfig_um-x86_64-gcc12 # Build took: 0:00:19.065164