180 lines
22 KiB
Text
180 lines
22 KiB
Text
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Researching: What programming language is the Linux kernel primarily written in?
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{"transport": "stdio", "server": "marchwarden-web-researcher", "event": "mcp_server_starting", "logger": "marchwarden.mcp", "level": "info", "timestamp": "2026-04-09T01:50:53.397487Z"}
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{"event": "Processing request of type CallToolRequest", "logger": "mcp.server.lowlevel.server", "level": "info", "timestamp": "2026-04-09T01:50:53.405825Z"}
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{"question": "What programming language is the Linux kernel primarily written in?", "depth": "balanced", "max_iterations": 5, "token_budget": 20000, "model_id": "claude-sonnet-4-6", "event": "research_started", "researcher": "web", "trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "logger": "marchwarden.researcher.web", "level": "info", "timestamp": "2026-04-09T01:50:53.438393Z"}
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{"step": 1, "decision": "Beginning research: depth=balanced", "question": "What programming language is the Linux kernel primarily written in?", "context": "", "max_iterations": 5, "token_budget": 20000, "event": "start", "researcher": "web", "trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "logger": "marchwarden.researcher.trace", "level": "info", "timestamp": "2026-04-09T01:50:53.438693Z"}
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{"step": 14, "decision": "Beginning synthesis of gathered evidence", "evidence_count": 16, "iterations_run": 3, "tokens_used": 18342, "event": "synthesis_start", "researcher": "web", "trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "logger": "marchwarden.researcher.trace", "level": "info", "timestamp": "2026-04-09T01:51:38.886838Z"}
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{"step": 15, "decision": "Parsed synthesis JSON successfully", "duration_ms": 38497, "event": "synthesis_complete", "researcher": "web", "trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "logger": "marchwarden.researcher.trace", "level": "info", "timestamp": "2026-04-09T01:52:16.247727Z"}
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{"step": 26, "decision": "Research complete", "confidence": 0.97, "citation_count": 6, "gap_count": 2, "discovery_count": 2, "total_duration_sec": 85.024, "event": "complete", "researcher": "web", "trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "logger": "marchwarden.researcher.trace", "level": "info", "timestamp": "2026-04-09T01:52:16.248500Z"}
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{"confidence": 0.97, "citations": 6, "gaps": 2, "discovery_events": 2, "tokens_used": 32922, "iterations_run": 3, "wall_time_sec": 82.80920100212097, "budget_exhausted": false, "event": "research_completed", "researcher": "web", "trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "logger": "marchwarden.researcher.web", "level": "info", "timestamp": "2026-04-09T01:52:16.248601Z"}
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{"error": "[Errno 13] Permission denied: '/home/micro/.marchwarden/costs.jsonl'", "event": "cost_ledger_write_failed", "researcher": "web", "trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "logger": "marchwarden.researcher.web", "level": "warning", "timestamp": "2026-04-09T01:52:16.248962Z"}
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{"event": "Processing request of type ListToolsRequest", "logger": "mcp.server.lowlevel.server", "level": "info", "timestamp": "2026-04-09T01:52:16.252134Z"}
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{"trace_id": "710b0a62-06c8-4f49-83e3-dc651c3702a9", "confidence": 0.97, "citations": 6, "tokens_used": 32922, "wall_time_sec": 82.80920100212097, "event": "ask_completed", "logger": "marchwarden.cli", "level": "info", "timestamp": "2026-04-09T01:52:16.444923Z"}
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╭─────────────────────────────────── Answer ───────────────────────────────────╮
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│ The Linux kernel is primarily written in the C programming language, │
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│ specifically the GNU dialect of ISO C11 (compiled with GCC under -std=gnu11, │
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│ or alternatively with Clang). Assembly language is also used for │
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│ architecture-specific low-level code. As of late 2022, Rust became an │
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│ officially supported second language in the kernel, and as of the 2025 Linux │
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│ Kernel Maintainer Summit, Rust was elevated from 'experimental' to a │
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│ permanent, first-class core language alongside C. According to Open Hub │
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│ statistics, C accounts for approximately 95.8% of total lines in the kernel │
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│ codebase, with Assembly at ~0.7% and Rust at ~0.3%. The kernel also uses │
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│ small amounts of shell script, Python, Make, and Perl for tooling purposes. │
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╰──────────────────────────────────────────────────────────────────────────────╯
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Citations
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┏━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┓
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┃ # ┃ Title / Locator ┃ Excerpt ┃ Conf ┃
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┡━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━┩
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│ 1 │ Programming Language — The │ The Linux kernel is written in │ 1.00 │
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│ │ Linux Kernel documentation │ the C programming language. │ │
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│ │ https://docs.kernel.org/proce │ More precisely, it is │ │
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│ │ ss/programming-language.html │ typically compiled with gcc │ │
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│ │ │ under -std=gnu11: the GNU │ │
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│ │ │ dialect of ISO C11. clang is │ │
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│ │ │ also supported. The kernel has │ │
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│ │ │ support for the Rust │ │
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│ │ │ programming language under │ │
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│ │ │ CONFIG_RUST. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 2 │ The Linux Kernel Open Source │ C | 36,226,652 | 5,218,548 | │ 0.97 │
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│ │ Project on Open Hub: │ 12.6% | 5,867,314 | 47,312,514 │ │
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│ │ Languages Page │ | 95.8% ... Assembly | 266,797 │ │
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│ │ https://openhub.net/p/linux/a │ | 50,339 | 15.9% | 49,347 | │ │
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│ │ nalyses/latest/languages_summ │ 366,483 | 0.7% ... Rust | │ │
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│ │ ary │ 90,778 | 35,328 | 28.0% | │ │
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│ │ │ 11,361 | 137,467 | 0.3% │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 3 │ Rust moves from experiment to │ The consensus among the │ 0.95 │
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│ │ a core Linux kernel language │ assembled developers is that │ │
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│ │ - Spiceworks │ Rust in the kernel is no │ │
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│ │ https://www.spiceworks.com/so │ longer experimental — it is │ │
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│ │ ftware/rust-moves-from-experi │ now a core part of the kernel │ │
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│ │ ment-to-a-core-linux-kernel-l │ and is here to stay. So the │ │
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│ │ anguage/ │ 'experimental' tag will be │ │
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│ │ │ coming off. This elevates Rust │ │
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│ │ │ to being the kernel's second │ │
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│ │ │ core language alongside C. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 4 │ Why Linux Kernel is written │ Although the current Linux │ 0.92 │
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│ │ in C-language but not in C++? │ Kernel source-code contain │ │
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│ │ https://thelinuxchannel.org/2 │ certain parts of the code │ │
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│ │ 024/06/why-linux-kernel-is-wr │ written in assembly code │ │
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│ │ itten-in-c-language-but-not-i │ (actually native CPU assembly │ │
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│ │ n-c-thelinuxchannel-kernelpro │ instructions) and recently │ │
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│ │ gramming/ │ certain parts of code written │ │
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│ │ │ in Rust Language, majority of │ │
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│ │ │ the Linux Kernel source-code │ │
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│ │ │ is only written in C Language. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 5 │ Linux Kernel Contributors And │ The Linux kernel crossed the │ 0.90 │
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│ │ Lines of Code Statistics 2026 │ 40 million line threshold with │ │
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│ │ https://commandlinux.com/stat │ version 6.14 rc1 in January │ │
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│ │ istics/linux-kernel-contribut │ 2025, containing precisely │ │
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│ │ ors-lines-of-code-statistics/ │ 40,063,856 lines. This │ │
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│ │ │ represents exponential growth │ │
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│ │ │ from the original 10,239 lines │ │
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│ │ │ in version 0.01 released in │ │
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│ │ │ 1991. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 6 │ Rust for Linux - Wikipedia │ Initial release | October 1, │ 0.93 │
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│ │ https://en.wikipedia.org/wiki │ 2022; 3 years ago (2022-10-01) │ │
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│ │ /Rust_for_Linux │ | Written in | Rust | │ │
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│ │ │ Operating system | Linux | │ │
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│ │ │ License | GPL-2.0-only with │ │
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│ │ │ Linux-syscall-note. │ │
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└─────┴───────────────────────────────┴────────────────────────────────┴───────┘
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Gaps
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┏━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
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┃ Category ┃ Topic ┃ Detail ┃
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┡━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
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│ source_not_found │ Exact current percentage │ Open Hub statistics may │
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│ │ of Rust code in the most │ not reflect the most │
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│ │ recent kernel versions │ recent kernel releases │
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│ │ (6.12+) │ (6.14+), so the exact │
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│ │ │ current Rust percentage │
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│ │ │ could be slightly higher │
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│ │ │ than 0.3% given active │
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│ │ │ Rust adoption. │
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├───────────────────────┼──────────────────────────┼───────────────────────────┤
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│ contradictory_sources │ Whether C++ is │ Open Hub reports C++ at │
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│ │ officially used in any │ 1.9% of total lines, yet │
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│ │ part of the kernel │ official kernel docs and │
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│ │ │ community sources say C │
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│ │ │ is the language and C++ │
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│ │ │ is not used. The C++ │
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│ │ │ lines may be in │
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│ │ │ tools/scripts not in the │
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│ │ │ kernel proper. │
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└───────────────────────┴──────────────────────────┴───────────────────────────┘
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Discovery Events
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┏━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
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┃ ┃ Suggested ┃ ┃ ┃
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┃ Type ┃ Researcher ┃ Query ┃ Reason ┃
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┡━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
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│ related_research │ null │ Linux kernel Rust │ Rust is growing │
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│ │ │ adoption rate │ quickly in the │
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│ │ │ 2025 lines of │ kernel; updated │
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│ │ │ code percentage │ statistics on its │
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│ │ │ │ share would be │
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│ │ │ │ valuable │
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├──────────────────┼───────────────────┼───────────────────┼───────────────────┤
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│ related_research │ null │ Linux kernel C++ │ Open Hub shows │
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│ │ │ code usage tools │ ~1.9% C++ but │
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│ │ │ vs kernel proper │ official docs do │
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│ │ │ │ not mention C++; │
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│ │ │ │ clarifying │
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│ │ │ │ whether this is │
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│ │ │ │ tooling code vs │
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│ │ │ │ kernel code would │
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│ │ │ │ resolve the │
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│ │ │ │ apparent │
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│ │ │ │ discrepancy │
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└──────────────────┴───────────────────┴───────────────────┴───────────────────┘
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Open Questions
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┏━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
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┃ Priority ┃ Question ┃ Context ┃
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┡━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
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│ medium │ Will Rust eventually surpass │ Rust is at ~0.3% and Assembly │
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│ │ Assembly in lines of code │ at ~0.7% per Open Hub; with │
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│ │ within the Linux kernel? │ active Rust driver development, │
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│ │ │ Rust may soon exceed Assembly │
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│ │ │ usage. │
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├──────────┼─────────────────────────────────┼─────────────────────────────────┤
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│ high │ What is the roadmap for Rust │ Rust is now a first-class │
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│ │ adoption in specific kernel │ language, but the Spiceworks │
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│ │ subsystems? │ article notes the focus is on │
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│ │ │ 'where, how fast, and under │
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│ │ │ whose terms does Rust spread │
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│ │ │ inside Linux'. │
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├──────────┼─────────────────────────────────┼─────────────────────────────────┤
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│ low │ Why does Open Hub report ~1.9% │ Open Hub's language breakdown │
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│ │ C++ in the Linux kernel │ shows 568,053 code lines of │
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│ │ codebase when official │ C++, which may belong to │
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│ │ documentation does not mention │ userspace tools or build │
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│ │ C++ as a supported kernel │ infrastructure bundled in the │
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│ │ language? │ same repository. │
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└──────────┴─────────────────────────────────┴─────────────────────────────────┘
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╭───────────────────────────────── Confidence ─────────────────────────────────╮
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│ Overall: 0.97 │
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│ Corroborating sources: 6 │
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│ Source authority: high │
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│ Contradiction detected: False │
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│ Query specificity match: 1.00 │
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│ Budget status: under cap │
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│ Recency: current │
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╰──────────────────────────────────────────────────────────────────────────────╯
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╭──────────────────────────────────── Cost ────────────────────────────────────╮
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│ Tokens: 32922 │
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│ Iterations: 3 │
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│ Wall time: 82.81s │
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│ Model: claude-sonnet-4-6 │
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╰──────────────────────────────────────────────────────────────────────────────╯
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trace_id: 710b0a62-06c8-4f49-83e3-dc651c3702a9
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