* Fix for /proc/<pid>/maps "stack" vma annotation
* sched stats not printing correct sleeping task PC * perf not reporting page faults -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJU9pzyAAoJEGnX8d3iisJe4+UP+gJmR69LPcyz+ZUZEaObpwSD 8D5Zz8csMtpvzW1IoIKo1qPLEkF59PpK2dt4K4xDmYf6GRftEiOryJ8ASu4NEJxd Rg13GuYazzjps22ztp9Cr6LiG5YrNuLG51HZdlGvoeZll8so87bjehKV5EWhpeBw 5+TGhAUwKmowdNiqO35DXalYGZCot7t7Wj9ADC3qzKzXmQnnSGK1Jp/iBtqX98Tu nlEow2jubrn8ofsifshYgViBseCHgMTn00Eqa1usb+a7DUv5PiPHsG/V29nzdRem g/f0Trp0uqSVsJ2Jlv/9rpWPaFN9XtCNhNV+kaXkhXlD2o2dhrbBSx+VGXMO5lBD lNwqfyfZ1EG+OyJnRK6BgKh9OTV4sK218iY5as2jtBq9crggTvGjRKUfEVyPOrdN MwBNjqiod/jB/lfom0FSO3JXo2DJwoLYmCEYLPuhIGfWr2yx8kFbnqdX/u7uzyg1 RezSKpQqMOMVkewB5tbcH3luZqLRsVNmKF/7ghtiaJfTR9QGIKdxATJtti7I4oTZ ARLG5W1JMjJKpVypxyvOvB8FlGKBxkqlZQiT8uCI8wMxgOntmOVtuNXaRJcf9qs0 3z/CrgRPvnZ09S4O0yfYjqqLwETph1mBjI8btspw55tq0ZLqs0lmcUpAF4zs+D+e LNMKue1NWxXNAFqorsSh =clY5 -----END PGP SIGNATURE----- Merge tag 'arc-4.0-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC fixes from Vineet Gupta: - Fix for /proc/<pid>/maps "stack" vma annotation - sched stats not printing correct sleeping task PC - perf not reporting page faults * tag 'arc-4.0-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: Fix thread_saved_pc() ARC: Fix KSTK_ESP() ARC: perf: Enable generic software events ARC: Make arc_unwind_core accessible externally
This commit is contained in:
commit
f2cb4777f6
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@ -47,9 +47,6 @@ struct thread_struct {
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/* Forward declaration, a strange C thing */
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struct task_struct;
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/* Return saved PC of a blocked thread */
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unsigned long thread_saved_pc(struct task_struct *t);
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#define task_pt_regs(p) \
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((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
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@ -72,18 +69,21 @@ unsigned long thread_saved_pc(struct task_struct *t);
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#define release_segments(mm) do { } while (0)
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
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/*
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* Where abouts of Task's sp, fp, blink when it was last seen in kernel mode.
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* Look in process.c for details of kernel stack layout
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*/
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#define KSTK_ESP(tsk) (tsk->thread.ksp)
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#define TSK_K_ESP(tsk) (tsk->thread.ksp)
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#define KSTK_REG(tsk, off) (*((unsigned int *)(KSTK_ESP(tsk) + \
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#define TSK_K_REG(tsk, off) (*((unsigned int *)(TSK_K_ESP(tsk) + \
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sizeof(struct callee_regs) + off)))
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#define KSTK_BLINK(tsk) KSTK_REG(tsk, 4)
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#define KSTK_FP(tsk) KSTK_REG(tsk, 0)
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#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
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#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
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#define thread_saved_pc(tsk) TSK_K_BLINK(tsk)
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extern void start_thread(struct pt_regs * regs, unsigned long pc,
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unsigned long usp);
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37
arch/arc/include/asm/stacktrace.h
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37
arch/arc/include/asm/stacktrace.h
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@ -0,0 +1,37 @@
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/*
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* Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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* Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_STACKTRACE_H
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#define __ASM_STACKTRACE_H
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#include <linux/sched.h>
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/**
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* arc_unwind_core - Unwind the kernel mode stack for an execution context
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* @tsk: NULL for current task, specific task otherwise
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* @regs: pt_regs used to seed the unwinder {SP, FP, BLINK, PC}
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* If NULL, use pt_regs of @tsk (if !NULL) otherwise
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* use the current values of {SP, FP, BLINK, PC}
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* @consumer_fn: Callback invoked for each frame unwound
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* Returns 0 to continue unwinding, -1 to stop
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* @arg: Arg to callback
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*
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* Returns the address of first function in stack
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*
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* Semantics:
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* - synchronous unwinding (e.g. dump_stack): @tsk NULL, @regs NULL
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* - Asynchronous unwinding of sleeping task: @tsk !NULL, @regs NULL
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* - Asynchronous unwinding of intr/excp etc: @tsk !NULL, @regs !NULL
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*/
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notrace noinline unsigned int arc_unwind_core(
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struct task_struct *tsk, struct pt_regs *regs,
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int (*consumer_fn) (unsigned int, void *),
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void *arg);
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#endif /* __ASM_STACKTRACE_H */
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@ -192,29 +192,6 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
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return 0;
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}
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/*
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* API: expected by schedular Code: If thread is sleeping where is that.
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* What is this good for? it will be always the scheduler or ret_from_fork.
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* So we hard code that anyways.
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*/
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unsigned long thread_saved_pc(struct task_struct *t)
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{
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struct pt_regs *regs = task_pt_regs(t);
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unsigned long blink = 0;
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/*
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* If the thread being queried for in not itself calling this, then it
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* implies it is not executing, which in turn implies it is sleeping,
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* which in turn implies it got switched OUT by the schedular.
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* In that case, it's kernel mode blink can reliably retrieved as per
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* the picture above (right above pt_regs).
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*/
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if (t != current && t->state != TASK_RUNNING)
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blink = *((unsigned int *)regs - 1);
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return blink;
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}
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int elf_check_arch(const struct elf32_hdr *x)
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{
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unsigned int eflags;
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@ -43,6 +43,10 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
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struct pt_regs *regs,
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struct unwind_frame_info *frame_info)
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{
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/*
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* synchronous unwinding (e.g. dump_stack)
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* - uses current values of SP and friends
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*/
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if (tsk == NULL && regs == NULL) {
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unsigned long fp, sp, blink, ret;
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frame_info->task = current;
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frame_info->regs.r63 = ret;
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frame_info->call_frame = 0;
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} else if (regs == NULL) {
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/*
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* Asynchronous unwinding of sleeping task
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* - Gets SP etc from task's pt_regs (saved bottom of kernel
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* mode stack of task)
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*/
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frame_info->task = tsk;
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frame_info->regs.r27 = KSTK_FP(tsk);
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frame_info->regs.r28 = KSTK_ESP(tsk);
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frame_info->regs.r31 = KSTK_BLINK(tsk);
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frame_info->regs.r27 = TSK_K_FP(tsk);
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frame_info->regs.r28 = TSK_K_ESP(tsk);
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frame_info->regs.r31 = TSK_K_BLINK(tsk);
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frame_info->regs.r63 = (unsigned int)__switch_to;
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/* In the prologue of __switch_to, first FP is saved on stack
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frame_info->call_frame = 0;
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} else {
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/*
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* Asynchronous unwinding of intr/exception
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* - Just uses the pt_regs passed
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*/
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frame_info->task = tsk;
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frame_info->regs.r27 = regs->fp;
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#endif
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static noinline unsigned int
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notrace noinline unsigned int
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arc_unwind_core(struct task_struct *tsk, struct pt_regs *regs,
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int (*consumer_fn) (unsigned int, void *), void *arg)
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{
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@ -12,6 +12,7 @@
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*/
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#include <linux/types.h>
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#include <linux/perf_event.h>
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#include <linux/ptrace.h>
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#include <linux/uaccess.h>
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#include <asm/disasm.h>
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}
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}
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perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, address);
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return 0;
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fault:
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@ -14,6 +14,7 @@
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#include <linux/ptrace.h>
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#include <linux/uaccess.h>
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#include <linux/kdebug.h>
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#include <linux/perf_event.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu.h>
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return;
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}
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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if (likely(!(fault & VM_FAULT_ERROR))) {
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if (flags & FAULT_FLAG_ALLOW_RETRY) {
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/* To avoid updating stats twice for retry case */
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if (fault & VM_FAULT_MAJOR)
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if (fault & VM_FAULT_MAJOR) {
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tsk->maj_flt++;
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else
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
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regs, address);
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} else {
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tsk->min_flt++;
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1,
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regs, address);
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}
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if (fault & VM_FAULT_RETRY) {
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flags &= ~FAULT_FLAG_ALLOW_RETRY;
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