From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Lutomirski Subject: Re: [PATCH 0/24] kernel: add a netlink interface to get information about processes (v2) Date: Tue, 7 Jul 2015 09:27:30 -0700 Message-ID: References: <1436172445-6979-1-git-send-email-avagin@openvz.org> <20150707154345.GA1593@odin.com> <20150707162552.GM3326@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <20150707162552.GM3326-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Arnaldo Carvalho de Melo Cc: Andrew Vagin , Andrey Vagin , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Linux API , Oleg Nesterov , Andrew Morton , Cyrill Gorcunov , Pavel Emelyanov , Roger Luethi , Arnd Bergmann , David Ahern , Pavel Odintsov List-Id: linux-api@vger.kernel.org On Tue, Jul 7, 2015 at 9:25 AM, Arnaldo Carvalho de Melo wrote: > Em Tue, Jul 07, 2015 at 06:43:46PM +0300, Andrew Vagin escreveu: >> On Mon, Jul 06, 2015 at 10:10:32AM -0700, Andy Lutomirski wrote: >> > On Mon, Jul 6, 2015 at 1:47 AM, Andrey Vagin wrote: >> > Would it make more sense to have a new syscall instead? You could >> > even still use nlattr formatting for the syscall results. >> >> Andy, thank you for the feedback. I got your points. I need time to >> think about them. I suppose that a new syscall can be more suitable in >> this case, and I need time to form a vision of it. If you have any ideas >> or thoughts, I would be glad to know about them. > > If a new syscall would indeed be better for this, then using > sys_perf_event_open and on one of the perf_event_attr flip a bit to ask > for those PERF_RECORD_{COMM,FORK,PERF_RECORD_MMAP2, etc} to be generated > in the perf buffer could make it reuse all the userspace tooling, with > really minimal change: flip the bit, don't synthesize it from /proc. > Hmm, that's an interesting thought. Andrew, would that work for you? --Andy