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[73.78.62.130]) by smtp.googlemail.com with ESMTPSA id o194-20020a0222cb000000b0037556012c63sm6119777jao.132.2022.11.16.16.20.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Nov 2022 16:20:29 -0800 (PST) From: Jim Cromie To: jbaron@akamai.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org Cc: Jim Cromie Subject: [PATCH 2/2] vmlinux.lds.h: add HEADERED_SECTION_* macros Date: Wed, 16 Nov 2022 17:20:22 -0700 Message-Id: <20221117002022.860237-3-jim.cromie@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221117002022.860237-1-jim.cromie@gmail.com> References: <20221117002022.860237-1-jim.cromie@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749700657712464005?= X-GMAIL-MSGID: =?utf-8?q?1749700657712464005?= These macros elaborate on BOUNDED_SECTION_(PRE|POST)_LABEL macros, prepending an optional KEEP(.gnu.linkonce##_sec_) reservation, and a linker-symbol to address it. This allows a developer to define a header struct (which must fit with the section's base struct-type), and could contain: 1- fields whose value is common to the entire set of data-records. This allows the header & data structs to specialize, complement each other, and shrink. 2- an uplink pointer to an organizing struct which refs other related/sub data-tables header record is addressable via the extern'd header linker-symbol Once the linker-symbols created by the macro are ref'd extern in code, that code can compute a record's index (ptr - start) in the "primary" table, then use it to index into the related/sub tables. Adding a primary.map_* field foreach sub-table would then allow deduplication and remapping of that sub-table. This is aimed at dyndbg's struct _ddebug __dyndbg[] section, whose 3 columns: function, file, module are 50%, 90%, 100% redundant. The module column is fully recoverable after dynamic_debug_init() saves it to each ddebug_table.module as the builtin __dyndbg[] table is parsed. Given that those 3 columns use 24/56 of a prdbg record, a dyndbg=y kernel with ~5k callsites could save substantially. Signed-off-by: Jim Cromie --- --- include/asm-generic/vmlinux.lds.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 85d5d5b203dc..a3b6aa30a525 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -214,6 +214,21 @@ #define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) +#define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ + _HDR_##_label_ = .; \ + KEEP(*(.gnu.linkonce.##_sec_)) \ + BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) + +#define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ + _label_##_HDR_ = .; \ + KEEP(*(.gnu.linkonce.##_sec_)) \ + BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) + +#define HEADERED_SECTION_BY(_sec_, _label_) \ + HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) + +#define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec) + #ifdef CONFIG_TRACE_BRANCH_PROFILING #define LIKELY_PROFILE() \ BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile)