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Committer:
Mathieu Desnoyers
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Author(s):
Michael Jeanson
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Date:
2019-04-10 21:08:56 UTC
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Revision ID:
git-v1:1b7b9c650ebb94358365512199559b0ece3e657c
Fix: Remove start and number from syscall_get_arguments() args (v5.1)
commit b35f549df1d7520d37ba1e6d4a8d4df6bd52d136
Author: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
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 <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>