perf tools: Refactor comm/tgid lookup
Rather than parsing /proc/pid/status file one line at a time, read it into a buffer in one shot and search for all strings in one pass. tgid conversion also simplified -- removing the isspace walk. As noted by Arnaldo those are not needed for atoi == strtol calls. Signed-off-by: NDavid Ahern <dsahern@gmail.com> Acked-by: NDon Zickus <dzickus@redhat.com> Acked-by: NJiri Olsa <jolsa@kernel.org> Cc: Joe Mario <jmario@redhat.com> Link: http://lkml.kernel.org/r/1427747758-18510-1-git-send-email-dsahern@gmail.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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