From: Joe Perches <joe@perches.com>
To: Kent Overstreet <kent.overstreet@gmail.com>
Cc: David Laight <David.Laight@ACULAB.COM>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"pmladek@suse.com" <pmladek@suse.com>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
"enozhatsky@chromium.org" <enozhatsky@chromium.org>,
"linux@rasmusvillemoes.dk" <linux@rasmusvillemoes.dk>,
"willy@infradead.org" <willy@infradead.org>
Subject: Re: [PATCH v4 00/34] Printbufs - new data structure for building strings
Date: Mon, 20 Jun 2022 18:26:58 -0700 [thread overview]
Message-ID: <a795818f9a49ed401bffc7c38ca7e39ae449e9e0.camel@perches.com> (raw)
In-Reply-To: <20220621005752.ohiq5besmy3r5rjo@moria.home.lan>
On Mon, 2022-06-20 at 20:57 -0400, Kent Overstreet wrote:
> On Mon, Jun 20, 2022 at 05:38:51PM -0700, Joe Perches wrote:
> > On Mon, 2022-06-20 at 11:07 -0400, Kent Overstreet wrote:
> > > On Mon, Jun 20, 2022 at 04:19:31AM +0000, David Laight wrote:
> > > > I really think that is a bad idea.
> > > > printk() already uses a lot of stack, anything doing a recursive
> > > > call is just making that worse.
> > > > Especially since these calls can often be in error paths
> > > > which are not often tested and can already be on deep stacks.
> > >
> > > We went over this before - this patch series drastically reduces stack usage of
> > > sprintf by eliminating a bunch of stack allocated buffers. Do try to keep up...
> >
> > I generally agree with David.
> >
> > I think Kent has not provided data that this actually _reduces_
> > stack usage.
>
> I think the people who are comfortable with reading C can discern that when
> large stack allocated character arrays are deleted, frame size and stack usage
> go down.
I am very comfortable reading C.
You have not provided any data.
next prev parent reply other threads:[~2022-06-21 1:27 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-20 0:41 Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 01/34] lib/printbuf: New data structure for printing strings Kent Overstreet
2022-06-20 4:44 ` David Laight
2022-06-20 15:30 ` Kent Overstreet
2022-06-20 15:53 ` David Laight
2022-06-20 16:14 ` Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 02/34] lib/string_helpers: Convert string_escape_mem() to printbuf Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 03/34] vsprintf: Convert " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 04/34] lib/hexdump: " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 05/34] vsprintf: %pf(%p) Kent Overstreet
2022-06-21 7:04 ` Rasmus Villemoes
2022-06-21 7:51 ` Kent Overstreet
2022-06-21 8:47 ` Rasmus Villemoes
2022-06-21 11:11 ` David Laight
2022-06-20 0:42 ` [PATCH v4 06/34] lib/string_helpers: string_get_size() now returns characters wrote Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 07/34] lib/printbuf: Heap allocation Kent Overstreet
2022-06-21 7:58 ` Rasmus Villemoes
2022-06-20 0:42 ` [PATCH v4 08/34] lib/printbuf: Tabstops, indenting Kent Overstreet
2022-06-21 8:14 ` Rasmus Villemoes
2022-06-20 0:42 ` [PATCH v4 09/34] lib/printbuf: Unit specifiers Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 10/34] lib/pretty-printers: prt_string_option(), prt_bitflags() Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 11/34] vsprintf: Improve number() Kent Overstreet
2022-06-21 8:33 ` Rasmus Villemoes
2022-06-20 0:42 ` [PATCH v4 12/34] vsprintf: prt_u64_minwidth(), prt_u64() Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 13/34] test_printf: Drop requirement that sprintf not write past nul Kent Overstreet
2022-06-21 7:19 ` Rasmus Villemoes
2022-06-21 7:52 ` Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 14/34] vsprintf: Start consolidating printf_spec handling Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 15/34] vsprintf: Refactor resource_string() Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 16/34] vsprintf: Refactor fourcc_string() Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 17/34] vsprintf: Refactor ip_addr_string() Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 18/34] vsprintf: Refactor mac_address_string() Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 19/34] vsprintf: time_and_date() no longer takes printf_spec Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 20/34] vsprintf: flags_string() " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 21/34] vsprintf: Refactor device_node_string, fwnode_string Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 22/34] vsprintf: Refactor hex_string, bitmap_string_list, bitmap_string Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 23/34] Input/joystick/analog: Convert from seq_buf -> printbuf Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 24/34] mm/memcontrol.c: Convert to printbuf Kent Overstreet
2022-06-20 11:37 ` Michal Hocko
2022-06-20 15:13 ` Kent Overstreet
2022-06-20 15:52 ` Michal Hocko
2022-06-20 0:42 ` [PATCH v4 25/34] clk: tegra: bpmp: " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 26/34] tools/testing/nvdimm: " Kent Overstreet
2022-06-24 19:32 ` Dan Williams
2022-06-24 23:42 ` Santosh Sivaraj
2022-07-01 6:32 ` Shivaprasad G Bhat
2022-06-20 0:42 ` [PATCH v4 27/34] powerpc: " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 28/34] x86/resctrl: " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 29/34] PCI/P2PDMA: " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 30/34] tracing: trace_events_synth: " Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 31/34] d_path: prt_path() Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 32/34] ACPI/APEI: Add missing include Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 33/34] tracing: Convert to printbuf Kent Overstreet
2022-06-20 0:42 ` [PATCH v4 34/34] Delete seq_buf Kent Overstreet
2022-06-20 4:19 ` [PATCH v4 00/34] Printbufs - new data structure for building strings David Laight
2022-06-20 4:54 ` Matthew Wilcox
2022-06-20 8:00 ` David Laight
2022-06-20 15:07 ` Kent Overstreet
2022-06-20 15:21 ` David Laight
2022-06-21 0:38 ` Joe Perches
2022-06-21 0:57 ` Kent Overstreet
2022-06-21 1:26 ` Joe Perches [this message]
2022-06-21 2:10 ` Joe Perches
2022-06-26 19:53 ` [RFC[ Alloc in vsprintf Joe Perches
2022-06-26 20:06 ` Kent Overstreet
2022-06-26 20:13 ` Joe Perches
2022-06-26 20:19 ` Linus Torvalds
2022-06-26 20:39 ` Joe Perches
2022-06-26 20:51 ` Kent Overstreet
2022-06-26 21:02 ` Joe Perches
2022-06-26 21:10 ` Kent Overstreet
2022-06-26 20:54 ` Linus Torvalds
2022-06-27 8:25 ` David Laight
2022-06-28 2:56 ` Kent Overstreet
2022-06-21 2:31 ` [PATCH v4 00/34] Printbufs - new data structure for building strings Kent Overstreet
2022-06-21 3:11 ` Kent Overstreet
2022-06-21 6:11 ` Rasmus Villemoes
2022-06-21 8:01 ` Kent Overstreet
2022-07-19 23:15 ` Steven Rostedt
2022-07-19 23:43 ` Kent Overstreet
2022-07-20 0:05 ` Steven Rostedt
2022-07-20 0:17 ` Kent Overstreet
2022-07-20 1:11 ` Steven Rostedt
2022-07-20 1:31 ` Kent Overstreet
2022-07-20 1:37 ` Steven Rostedt
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