From: Andy Shevchenko <andy.shevchenko@gmail.com> To: Tom Zanussi <tom.zanussi@linux.intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org>, Stuart Longland <stuartl@longlandclan.id.au>, Nicolas Pitre <nicolas.pitre@linaro.org>, Andi Kleen <andi@firstfloor.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, "linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Date: Tue, 4 Apr 2017 21:04:24 +0300 [thread overview] Message-ID: <CAHp75VfQVdMRZnbDFyH9m=HfSuoiUxqhf2y+H07u4u6xPd7DUA@mail.gmail.com> (raw) In-Reply-To: <1491328749.7125.66.camel@tzanussi-mobl.amr.corp.intel.com> On Tue, Apr 4, 2017 at 8:59 PM, Tom Zanussi <tom.zanussi@linux.intel.com> wrote: > On Tue, 2017-04-04 at 20:08 +0300, Andy Shevchenko wrote: >> On Tue, Apr 4, 2017 at 7:59 PM, Tom Zanussi <tom.zanussi@linux.intel.com> wrote: >> > On Tue, 2017-04-04 at 00:05 +0300, Andy Shevchenko wrote: >> > I was focused at that point mainly on the kernel static size, and using >> > a combination of Josh Triplett's tinification tree, Andi Kleen's LTO and >> > net-diet patches, and my own miscellaneous patches that I was planning >> > on eventually upstreaming, I ended up with a system that I could boot to >> > shell with a 455k text size: >> > >> > Memory: 235636K/245176K available (455K kernel code, 61K rwdata, >> > 64K rodata, 132K init, 56K bss, 3056K reserved, 0K cma-reserved) >> Thanks for sharing your experience. The question closer to this >> discussion what did you do against TTY/UART/(related) layer(s)? >> > > I'd have to go back and take a look, but nothing special AFIAR. > > No patches or hacks along those lines, and the only related thing I see > as far as config is: > > cfg/pty-disable.scc \ > > which maps to: > > # CONFIG_UNIX98_PTYS is not set But on your guestimation how much can we squeeze TTY/UART layer if we do some compile-time configuration? Does it even make sense or better to introduce something like minitty special layer instead? I believe you did some research during time of that project… -- With Best Regards, Andy Shevchenko
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From: andy.shevchenko@gmail.com (Andy Shevchenko) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Date: Tue, 4 Apr 2017 21:04:24 +0300 [thread overview] Message-ID: <CAHp75VfQVdMRZnbDFyH9m=HfSuoiUxqhf2y+H07u4u6xPd7DUA@mail.gmail.com> (raw) In-Reply-To: <1491328749.7125.66.camel@tzanussi-mobl.amr.corp.intel.com> On Tue, Apr 4, 2017 at 8:59 PM, Tom Zanussi <tom.zanussi@linux.intel.com> wrote: > On Tue, 2017-04-04 at 20:08 +0300, Andy Shevchenko wrote: >> On Tue, Apr 4, 2017 at 7:59 PM, Tom Zanussi <tom.zanussi@linux.intel.com> wrote: >> > On Tue, 2017-04-04 at 00:05 +0300, Andy Shevchenko wrote: >> > I was focused at that point mainly on the kernel static size, and using >> > a combination of Josh Triplett's tinification tree, Andi Kleen's LTO and >> > net-diet patches, and my own miscellaneous patches that I was planning >> > on eventually upstreaming, I ended up with a system that I could boot to >> > shell with a 455k text size: >> > >> > Memory: 235636K/245176K available (455K kernel code, 61K rwdata, >> > 64K rodata, 132K init, 56K bss, 3056K reserved, 0K cma-reserved) >> Thanks for sharing your experience. The question closer to this >> discussion what did you do against TTY/UART/(related) layer(s)? >> > > I'd have to go back and take a look, but nothing special AFIAR. > > No patches or hacks along those lines, and the only related thing I see > as far as config is: > > cfg/pty-disable.scc \ > > which maps to: > > # CONFIG_UNIX98_PTYS is not set But on your guestimation how much can we squeeze TTY/UART layer if we do some compile-time configuration? Does it even make sense or better to introduce something like minitty special layer instead? I believe you did some research during time of that project? -- With Best Regards, Andy Shevchenko
next prev parent reply other threads:[~2017-04-04 18:04 UTC|newest] Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-01 22:21 [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre 2017-04-01 22:21 ` Nicolas Pitre 2017-04-01 22:21 ` [PATCH v2 1/5] console: move console_init() out of tty_io.c Nicolas Pitre 2017-04-01 22:21 ` Nicolas Pitre 2017-04-01 22:21 ` [PATCH v2 2/5] tty: move baudrate handling code to a file of its own Nicolas Pitre 2017-04-01 22:21 ` Nicolas Pitre 2017-04-01 22:21 ` [PATCH v2 3/5] serial: small Makefile reordering Nicolas Pitre 2017-04-01 22:21 ` Nicolas Pitre 2017-04-02 12:55 ` Andy Shevchenko 2017-04-02 12:55 ` Andy Shevchenko 2017-04-02 15:49 ` Nicolas Pitre 2017-04-02 15:49 ` Nicolas Pitre 2017-04-01 22:21 ` [PATCH v2 4/5] serial: split generic UART driver helper functions into a separate file Nicolas Pitre 2017-04-01 22:21 ` Nicolas Pitre 2017-04-02 13:16 ` Andy Shevchenko 2017-04-02 13:16 ` Andy Shevchenko 2017-04-02 15:44 ` Nicolas Pitre 2017-04-02 15:44 ` Nicolas Pitre 2017-04-03 7:35 ` kbuild test robot 2017-04-03 7:35 ` kbuild test robot 2017-04-01 22:21 ` [PATCH v2 5/5] minitty: minimal TTY support alternative for serial ports Nicolas Pitre 2017-04-01 22:21 ` Nicolas Pitre 2017-04-02 13:22 ` [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andy Shevchenko 2017-04-02 13:22 ` Andy Shevchenko 2017-04-02 15:55 ` Nicolas Pitre 2017-04-02 15:55 ` Nicolas Pitre 2017-04-03 12:56 ` Alan Cox 2017-04-03 12:56 ` Alan Cox 2017-04-03 16:06 ` Nicolas Pitre 2017-04-03 16:06 ` Nicolas Pitre 2017-04-03 16:06 ` Nicolas Pitre 2017-04-03 18:05 ` Alan Cox 2017-04-03 18:05 ` Alan Cox 2017-04-03 19:50 ` Nicolas Pitre 2017-04-03 19:50 ` Nicolas Pitre 2017-04-04 13:40 ` Alan Cox 2017-04-04 13:40 ` Alan Cox 2017-04-04 19:26 ` Nicolas Pitre 2017-04-04 19:26 ` Nicolas Pitre 2017-04-02 20:47 ` Andi Kleen 2017-04-02 20:47 ` Andi Kleen 2017-04-02 21:41 ` Nicolas Pitre 2017-04-02 21:41 ` Nicolas Pitre 2017-04-02 22:44 ` Stuart Longland 2017-04-02 22:44 ` Stuart Longland 2017-04-02 22:44 ` Stuart Longland 2017-04-03 1:01 ` Nicolas Pitre 2017-04-03 1:01 ` Nicolas Pitre 2017-04-04 0:39 ` Stuart Longland 2017-04-04 0:39 ` Stuart Longland 2017-04-04 0:39 ` Stuart Longland 2017-04-03 18:14 ` Geert Uytterhoeven 2017-04-03 18:14 ` Geert Uytterhoeven 2017-04-03 18:14 ` Geert Uytterhoeven 2017-04-03 18:57 ` Rob Herring 2017-04-03 18:57 ` Rob Herring 2017-04-03 18:57 ` Rob Herring 2017-04-03 19:46 ` Geert Uytterhoeven 2017-04-03 19:46 ` Geert Uytterhoeven 2017-04-03 19:46 ` Geert Uytterhoeven 2017-04-03 21:05 ` Andy Shevchenko 2017-04-03 21:05 ` Andy Shevchenko 2017-04-03 21:05 ` Andy Shevchenko 2017-04-04 16:59 ` Tom Zanussi 2017-04-04 16:59 ` Tom Zanussi 2017-04-04 16:59 ` Tom Zanussi 2017-04-04 17:08 ` Andy Shevchenko 2017-04-04 17:08 ` Andy Shevchenko 2017-04-04 17:08 ` Andy Shevchenko 2017-04-04 17:59 ` Tom Zanussi 2017-04-04 17:59 ` Tom Zanussi 2017-04-04 17:59 ` Tom Zanussi 2017-04-04 18:04 ` Andy Shevchenko [this message] 2017-04-04 18:04 ` Andy Shevchenko 2017-04-04 18:04 ` Andy Shevchenko 2017-04-04 18:31 ` Nicolas Pitre 2017-04-04 18:31 ` Nicolas Pitre 2017-04-04 18:31 ` Nicolas Pitre 2017-04-04 19:58 ` Tom Zanussi 2017-04-04 19:58 ` Tom Zanussi 2017-04-04 19:58 ` Tom Zanussi 2017-04-04 20:27 ` Nicolas Pitre 2017-04-04 20:27 ` Nicolas Pitre 2017-04-04 20:27 ` Nicolas Pitre 2017-04-04 18:53 ` Nicolas Pitre 2017-04-04 18:53 ` Nicolas Pitre 2017-04-04 18:53 ` Nicolas Pitre 2017-04-03 7:54 ` Andy Shevchenko 2017-04-03 7:54 ` Andy Shevchenko 2017-04-03 15:31 ` Andi Kleen 2017-04-03 15:31 ` Andi Kleen 2017-04-03 17:27 ` Nicolas Pitre 2017-04-03 17:27 ` Nicolas Pitre 2017-04-03 19:57 ` Adam Borowski 2017-04-03 19:57 ` Adam Borowski 2017-04-03 20:09 ` Nicolas Pitre 2017-04-03 20:09 ` Nicolas Pitre 2017-04-03 20:32 ` Adam Borowski 2017-04-03 20:32 ` Adam Borowski 2017-04-03 16:40 ` Nicolas Pitre 2017-04-03 16:40 ` Nicolas Pitre 2017-04-03 7:44 ` Greg Kroah-Hartman 2017-04-03 7:44 ` Greg Kroah-Hartman
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