linux-kernel - [PATCH 6/5] objtool: Optimize elf_dirty_reloc

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Date:   Wed, 2 Nov 2022 22:46:44 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, djwong@...nel.org,
        yujie.liu@...el.com, tglx@...utronix.de, jpoimboe@...nel.org,
        joao.moreira@...el.com, samitolvanen@...gle.com
Subject: [PATCH 6/5] objtool: Optimize elf_dirty_reloc_sym()

Subject: objtool: Optimize elf_dirty_reloc_sym()
From: Peter Zijlstra <peterz@...radead.org>
Date: Wed Nov  2 22:31:19 CET 2022

When moving a symbol in the symtab its index changes and any reloc
referring that symtol-table-index will need to be rewritten too.

In order to facilitate this, objtool simply marks the whole reloc
section 'changed' which will cause the whole section to be
re-generated.

However, finding the relocs that use any given symbol is implemented
rather crudely -- a fully iteration of all sections and their relocs.
Given that some builds have over 20k sections (kallsyms etc..)
iterating all that for *each* symbol moved takes a bit of time.

Instead have each symbol keep a list of relocs that reference it.

This *vastly* improves build times for certain configs.

Reported-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 tools/objtool/elf.c                 |   27 ++++++++++-----------------
 tools/objtool/include/objtool/elf.h |    2 ++
 2 files changed, 12 insertions(+), 17 deletions(-)

--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -356,6 +356,7 @@ static void elf_add_symbol(struct elf *e
 	struct rb_node *pnode;
 	struct symbol *iter;
 
+	INIT_LIST_HEAD(&sym->reloc_list);
 	INIT_LIST_HEAD(&sym->pv_target);
 	sym->alias = sym;
 
@@ -557,6 +558,7 @@ int elf_add_reloc(struct elf *elf, struc
 	reloc->sym = sym;
 	reloc->addend = addend;
 
+	list_add_tail(&reloc->sym_reloc_entry, &sym->reloc_list);
 	list_add_tail(&reloc->list, &sec->reloc->reloc_list);
 	elf_hash_add(reloc, &reloc->hash, reloc_hash(reloc));
 
@@ -573,21 +575,10 @@ int elf_add_reloc(struct elf *elf, struc
  */
 static void elf_dirty_reloc_sym(struct elf *elf, struct symbol *sym)
 {
-	struct section *sec;
-
-	list_for_each_entry(sec, &elf->sections, list) {
-		struct reloc *reloc;
-
-		if (sec->changed)
-			continue;
+	struct reloc *reloc;
 
-		list_for_each_entry(reloc, &sec->reloc_list, list) {
-			if (reloc->sym == sym) {
-				sec->changed = true;
-				break;
-			}
-		}
-	}
+	list_for_each_entry(reloc, &sym->reloc_list, sym_reloc_entry)
+		reloc->sec->changed = true;
 }
 
 /*
@@ -902,11 +893,12 @@ static int read_rela_reloc(struct sectio
 
 static int read_relocs(struct elf *elf)
 {
+	unsigned long nr_reloc, max_reloc = 0, tot_reloc = 0;
 	struct section *sec;
 	struct reloc *reloc;
-	int i;
 	unsigned int symndx;
-	unsigned long nr_reloc, max_reloc = 0, tot_reloc = 0;
+	struct symbol *sym;
+	int i;
 
 	if (!elf_alloc_hash(reloc, elf->text_size / 16))
 		return -1;
@@ -947,13 +939,14 @@ static int read_relocs(struct elf *elf)
 
 			reloc->sec = sec;
 			reloc->idx = i;
-			reloc->sym = find_symbol_by_index(elf, symndx);
+			reloc->sym = sym = find_symbol_by_index(elf, symndx);
 			if (!reloc->sym) {
 				WARN("can't find reloc entry symbol %d for %s",
 				     symndx, sec->name);
 				return -1;
 			}
 
+			list_add_tail(&reloc->sym_reloc_entry, &sym->reloc_list);
 			list_add_tail(&reloc->list, &sec->reloc_list);
 			elf_hash_add(reloc, &reloc->hash, reloc_hash(reloc));
 
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -62,6 +62,7 @@ struct symbol {
 	u8 fentry            : 1;
 	u8 profiling_func    : 1;
 	struct list_head pv_target;
+	struct list_head reloc_list;
 };
 
 struct reloc {
@@ -73,6 +74,7 @@ struct reloc {
 	};
 	struct section *sec;
 	struct symbol *sym;
+	struct list_head sym_reloc_entry;
 	unsigned long offset;
 	unsigned int type;
 	s64 addend;