From: Michael Jeanson Date: Tue, 9 Apr 2019 18:12:41 +0000 (-0400) Subject: Fix: Remove start and number from syscall_get_arguments() args (v5.1) X-Git-Tag: v2.12.0-pre~54 X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;h=1b7b9c650ebb94358365512199559b0ece3e657c;hp=1b7b9c650ebb94358365512199559b0ece3e657c;p=lttng-modules.git Fix: Remove start and number from syscall_get_arguments() args (v5.1) commit b35f549df1d7520d37ba1e6d4a8d4df6bd52d136 Author: Steven Rostedt (Red Hat) Date: Mon Nov 7 16:26:37 2016 -0500 syscalls: Remove start and number from syscall_get_arguments() args 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 Signed-off-by: Michael Jeanson Signed-off-by: Mathieu Desnoyers ---