8b946cc38e
Andi reported that objtool on vmlinux.o consumes more memory than his system has, leading to horrific performance. This is in part because we keep a struct instruction for every instruction in the file in-memory. Shrink struct instruction by removing the CFI state (which includes full register state) from it and demand allocating it. Given most instructions don't actually change CFI state, there's lots of repetition there, so add a hash table to find previous CFI instances. Reduces memory consumption (and runtime) for processing an x86_64-allyesconfig: pre: 4:40.84 real, 143.99 user, 44.18 sys, 30624988 mem post: 2:14.61 real, 108.58 user, 25.04 sys, 16396184 mem Suggested-by: Andi Kleen <andi@firstfloor.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20210624095147.756759107@infradead.org
40 lines
759 B
C
40 lines
759 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
|
|
*/
|
|
|
|
#ifndef _OBJTOOL_CFI_H
|
|
#define _OBJTOOL_CFI_H
|
|
|
|
#include <arch/cfi_regs.h>
|
|
#include <linux/list.h>
|
|
|
|
#define CFI_UNDEFINED -1
|
|
#define CFI_CFA -2
|
|
#define CFI_SP_INDIRECT -3
|
|
#define CFI_BP_INDIRECT -4
|
|
|
|
struct cfi_reg {
|
|
int base;
|
|
int offset;
|
|
};
|
|
|
|
struct cfi_init_state {
|
|
struct cfi_reg regs[CFI_NUM_REGS];
|
|
struct cfi_reg cfa;
|
|
};
|
|
|
|
struct cfi_state {
|
|
struct hlist_node hash; /* must be first, cficmp() */
|
|
struct cfi_reg regs[CFI_NUM_REGS];
|
|
struct cfi_reg vals[CFI_NUM_REGS];
|
|
struct cfi_reg cfa;
|
|
int stack_size;
|
|
int drap_reg, drap_offset;
|
|
unsigned char type;
|
|
bool bp_scratch;
|
|
bool drap;
|
|
bool end;
|
|
};
|
|
|
|
#endif /* _OBJTOOL_CFI_H */
|