mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
b35f549df1
At Linux Plumbers, Andy Lutomirski approached me and pointed out that the function call syscall_get_arguments() implemented in x86 was horribly written and not optimized for the standard case of passing in 0 and 6 for the starting index and the number of system calls to get. When looking at all the users of this function, I discovered that all instances pass in only 0 and 6 for these arguments. Instead of having this function handle different cases that are never used, simply rewrite it to return the first 6 arguments of a system call. This should help out the performance of tracing system calls by ptrace, ftrace and perf. Link: http://lkml.kernel.org/r/20161107213233.754809394@goodmis.org Cc: Oleg Nesterov <oleg@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Cc: Dave Martin <dave.martin@arm.com> Cc: "Dmitry V. Levin" <ldv@altlinux.org> Cc: x86@kernel.org Cc: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: uclinux-h8-devel@lists.sourceforge.jp Cc: linux-hexagon@vger.kernel.org Cc: linux-ia64@vger.kernel.org Cc: linux-mips@vger.kernel.org Cc: nios2-dev@lists.rocketboards.org Cc: openrisc@lists.librecores.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-riscv@lists.infradead.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: linux-um@lists.infradead.org Cc: linux-xtensa@linux-xtensa.org Cc: linux-arch@vger.kernel.org Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts Acked-by: Max Filippov <jcmvbkbc@gmail.com> # For xtensa changes Acked-by: Will Deacon <will.deacon@arm.com> # For the arm64 bits Reviewed-by: Thomas Gleixner <tglx@linutronix.de> # for x86 Reviewed-by: Dmitry V. Levin <ldv@altlinux.org> Reported-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#undef TRACE_SYSTEM
|
|
#define TRACE_SYSTEM raw_syscalls
|
|
#undef TRACE_INCLUDE_FILE
|
|
#define TRACE_INCLUDE_FILE syscalls
|
|
|
|
#if !defined(_TRACE_EVENTS_SYSCALLS_H) || defined(TRACE_HEADER_MULTI_READ)
|
|
#define _TRACE_EVENTS_SYSCALLS_H
|
|
|
|
#include <linux/tracepoint.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/syscall.h>
|
|
|
|
|
|
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
|
|
|
|
TRACE_EVENT_FN(sys_enter,
|
|
|
|
TP_PROTO(struct pt_regs *regs, long id),
|
|
|
|
TP_ARGS(regs, id),
|
|
|
|
TP_STRUCT__entry(
|
|
__field( long, id )
|
|
__array( unsigned long, args, 6 )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->id = id;
|
|
syscall_get_arguments(current, regs, __entry->args);
|
|
),
|
|
|
|
TP_printk("NR %ld (%lx, %lx, %lx, %lx, %lx, %lx)",
|
|
__entry->id,
|
|
__entry->args[0], __entry->args[1], __entry->args[2],
|
|
__entry->args[3], __entry->args[4], __entry->args[5]),
|
|
|
|
syscall_regfunc, syscall_unregfunc
|
|
);
|
|
|
|
TRACE_EVENT_FLAGS(sys_enter, TRACE_EVENT_FL_CAP_ANY)
|
|
|
|
TRACE_EVENT_FN(sys_exit,
|
|
|
|
TP_PROTO(struct pt_regs *regs, long ret),
|
|
|
|
TP_ARGS(regs, ret),
|
|
|
|
TP_STRUCT__entry(
|
|
__field( long, id )
|
|
__field( long, ret )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->id = syscall_get_nr(current, regs);
|
|
__entry->ret = ret;
|
|
),
|
|
|
|
TP_printk("NR %ld = %ld",
|
|
__entry->id, __entry->ret),
|
|
|
|
syscall_regfunc, syscall_unregfunc
|
|
);
|
|
|
|
TRACE_EVENT_FLAGS(sys_exit, TRACE_EVENT_FL_CAP_ANY)
|
|
|
|
#endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */
|
|
|
|
#endif /* _TRACE_EVENTS_SYSCALLS_H */
|
|
|
|
/* This part must be outside protection */
|
|
#include <trace/define_trace.h>
|
|
|