From: Sasha Levin <sashal@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sashal@kernel.org>,
linux-kernel@vger.kernel.org, Bill Wendling <morbo@google.com>,
Chuck Wolber <chuck@wolber.net>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Justin Stitt <justinstitt@google.com>,
llvm@lists.linux.dev, Marco Elver <elver@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Thomas Gleixner <tglx@kernel.org>
Subject: Re: [RFC PATCH 11/20] objtool: Detect code coverage instrumentation in noinstr code
Date: Wed, 28 Oct 2026 12:45:55 -0400 [thread overview]
Message-ID: <20261028164556.1610305-2-sashal@kernel.org> (raw)
In-Reply-To: <20261028141148.GT2668564@noisy.programming.kicks-ass.net>
On Wed, Oct 28, 2026 at 03:11:48PM +0100, Peter Zijlstra wrote:
>Since you can have many relocations to the same symbol; does it make
>sense to cache the results of those many strcmp()s in symbol::coverage
>or something? We have plenty bits left in struct symbol.
Sure, I'll throw in a symbol::coverage_counter bit in classify_symbols(). It
has to happen before the is_global_sym() check there, since the counters, and
the section symbols that relocations often point at, are local.
>Perhaps merge with the previous conditional?
Will do.
--
Thanks,
Sasha
next prev parent reply other threads:[~2026-10-28 16:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 11:59 [RFC PATCH 00/20] Unify code coverage and add Clang source-based coverage with MC/DC Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 01/20] coverage: move gcov and kcov under kernel/coverage/ Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 02/20] kbuild: unify static coverage instrumentation as COVERAGE_PROFILE Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 03/20] coverage: add a common debugfs interface Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 04/20] compiler_types.h: Don't instrument __always_inline functions for coverage Sasha Levin
2026-10-28 13:51 ` Peter Zijlstra
2026-10-28 14:01 ` Peter Zijlstra
2026-10-28 16:45 ` Sasha Levin
2026-10-29 5:49 ` Chuck Wolber
2026-10-28 11:59 ` [RFC PATCH 05/20] context_tracking: Always inline the empty stubs called from noinstr code Sasha Levin
2026-10-28 13:52 ` Peter Zijlstra
2026-10-28 11:59 ` [RFC PATCH 06/20] lockdep: " Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 07/20] perf: Always inline the empty perf_lopwr_cb() stub Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 08/20] rseq: Always inline the empty rseq_note_user_irq_entry() stub Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 09/20] x86: Always inline empty stubs called from noinstr code Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 10/20] x86/sev: Use non-instrumented bitops in the GHCB accessors Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 11/20] objtool: Detect code coverage instrumentation in noinstr code Sasha Levin
2026-10-28 14:11 ` Peter Zijlstra
2026-10-28 16:45 ` Sasha Levin [this message]
2026-10-28 11:59 ` [RFC PATCH 12/20] x86/sev: Stop excluding noinstr.o from code coverage Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 13/20] x86/entry: Stop excluding the entry code from KCOV Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 14/20] coverage: add Clang's source-based code coverage Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 15/20] x86: Enable " Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 16/20] coverage: add MC/DC measurement Sasha Levin
2026-10-28 19:14 ` Nathan Chancellor
2026-10-28 20:39 ` Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 17/20] gcov: fix gcov_info_add() merge semantics for IOR counters Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 18/20] kconfig: add CC_HAS_CONDITION_COVERAGE for MC/DC support detection Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 19/20] gcov: add MC/DC condition coverage support Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 20/20] Documentation: dev-tools: document the common code coverage interface Sasha Levin
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