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Alexei Starovoitov
c0e4a193ae
Eduard Zingerman says: ==================== bpf: unify state pruning handling of invalid/misc stack slots This change unifies states pruning handling of NOT_INIT registers, STACK_INVALID/STACK_MISC stack slots for regular and iterator/callback based loop cases. The change results in a modest verifier performance improvement: ========= selftests: master vs loop-stack-misc-pruning ========= File Program Insns (A) Insns (B) Insns (DIFF) ------------------------------- -------------------- --------- --------- ---------------- test_tcp_custom_syncookie.bpf.o tcp_custom_syncookie 38307 18430 -19877 (-51.89%) xdp_synproxy_kern.bpf.o syncookie_tc 23035 19067 -3968 (-17.23%) xdp_synproxy_kern.bpf.o syncookie_xdp 21022 18516 -2506 (-11.92%) Total progs: 4173 Old success: 2520 New success: 2521 total_insns diff min: -99.99% total_insns diff max: 0.00% 0 -> value: 0 value -> 0: 0 total_insns abs max old: 837,487 total_insns abs max new: 837,487 -100 .. -90 %: 1 -60 .. -50 %: 3 -50 .. -40 %: 2 -40 .. -30 %: 2 -30 .. -20 %: 8 -20 .. -10 %: 4 -10 .. 0 %: 5 0 .. 5 %: 4148 ========= scx: master vs loop-stack-misc-pruning ========= File Program Insns (A) Insns (B) Insns (DIFF) ------------------------- ---------------- --------- --------- ---------------- scx_arena_selftests.bpf.o arena_selftest 257545 243678 -13867 (-5.38%) scx_chaos.bpf.o chaos_dispatch 13989 12804 -1185 (-8.47%) scx_layered.bpf.o layered_dispatch 27600 13925 -13675 (-49.55%) Total progs: 305 Old success: 292 New success: 292 total_insns diff min: -49.55% total_insns diff max: 0.00% 0 -> value: 0 value -> 0: 0 total_insns abs max old: 257,545 total_insns abs max new: 243,678 -50 .. -45 %: 7 -30 .. -20 %: 5 -20 .. -10 %: 14 -10 .. 0 %: 18 0 .. 5 %: 261 There is also a significant verifier performance improvement for some bpf_loop() heavy Meta internal programs (~ -40% processed instructions). ==================== Link: https://patch.msgid.link/20251230-loop-stack-misc-pruning-v1-0-585cfd6cec51@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst