lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 16 Feb 2024 01:03:22 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Pasha Tatashin <pasha.tatashin@...een.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	mhocko@...e.com, vbabka@...e.cz, hannes@...xchg.org, roman.gushchin@...ux.dev, 
	mgorman@...e.de, dave@...olabs.net, willy@...radead.org, 
	liam.howlett@...cle.com, corbet@....net, void@...ifault.com, 
	peterz@...radead.org, juri.lelli@...hat.com, catalin.marinas@....com, 
	will@...nel.org, arnd@...db.de, tglx@...utronix.de, mingo@...hat.com, 
	dave.hansen@...ux.intel.com, x86@...nel.org, peterx@...hat.com, 
	david@...hat.com, axboe@...nel.dk, mcgrof@...nel.org, masahiroy@...nel.org, 
	nathan@...nel.org, dennis@...nel.org, tj@...nel.org, muchun.song@...ux.dev, 
	rppt@...nel.org, paulmck@...nel.org, yosryahmed@...gle.com, yuzhao@...gle.com, 
	dhowells@...hat.com, hughd@...gle.com, andreyknvl@...il.com, 
	keescook@...omium.org, ndesaulniers@...gle.com, vvvvvv@...gle.com, 
	gregkh@...uxfoundation.org, ebiggers@...gle.com, ytcoode@...il.com, 
	vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org, 
	bsegall@...gle.com, bristot@...hat.com, vschneid@...hat.com, cl@...ux.com, 
	penberg@...nel.org, iamjoonsoo.kim@....com, 42.hyeyoo@...il.com, 
	glider@...gle.com, elver@...gle.com, dvyukov@...gle.com, shakeelb@...gle.com, 
	songmuchun@...edance.com, jbaron@...mai.com, rientjes@...gle.com, 
	minchan@...gle.com, kaleshsingh@...gle.com, kernel-team@...roid.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	iommu@...ts.linux.dev, linux-arch@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, 
	linux-modules@...r.kernel.org, kasan-dev@...glegroups.com, 
	cgroups@...r.kernel.org
Subject: Re: [PATCH v3 13/35] lib: add allocation tagging support for memory
 allocation profiling

On Fri, Feb 16, 2024 at 1:02 AM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> On Thu, Feb 15, 2024 at 5:27 PM Kent Overstreet
> <kent.overstreet@...ux.dev> wrote:
> >
> > On Thu, Feb 15, 2024 at 08:22:44PM -0500, Pasha Tatashin wrote:
> > > On Thu, Feb 15, 2024 at 8:00 PM Kent Overstreet
> > > <kent.overstreet@...ux.dev> wrote:
> > > >
> > > > On Thu, Feb 15, 2024 at 04:54:38PM -0800, Andrew Morton wrote:
> > > > > On Mon, 12 Feb 2024 13:38:59 -0800 Suren Baghdasaryan <surenb@...gle.com> wrote:
> > > > >
> > > > > > +Example output.
> > > > > > +
> > > > > > +::
> > > > > > +
> > > > > > +    > cat /proc/allocinfo
> > > > > > +
> > > > > > +      153MiB     mm/slub.c:1826 module:slub func:alloc_slab_page
> > > > > > +     6.08MiB     mm/slab_common.c:950 module:slab_common func:_kmalloc_order
> > > > > > +     5.09MiB     mm/memcontrol.c:2814 module:memcontrol func:alloc_slab_obj_exts
> > > > > > +     4.54MiB     mm/page_alloc.c:5777 module:page_alloc func:alloc_pages_exact
> > > > > > +     1.32MiB     include/asm-generic/pgalloc.h:63 module:pgtable func:__pte_alloc_one
> > > > >
> > > > > I don't really like the fancy MiB stuff.  Wouldn't it be better to just
> > > > > present the amount of memory in plain old bytes, so people can use sort
> > > > > -n on it?
> > > >
> > > > They can use sort -h on it; the string_get_size() patch was specifically
> > > > so that we could make the output compatible with sort -h
> > > >
> > > > > And it's easier to tell big-from-small at a glance because
> > > > > big has more digits.
> > > > >
> > > > > Also, the first thing any sort of downstream processing of this data is
> > > > > going to have to do is to convert the fancified output back into
> > > > > plain-old-bytes.  So why not just emit plain-old-bytes?
> > > > >
> > > > > If someone wants the fancy output (and nobody does) then that can be
> > > > > done in userspace.
> > > >
> > > > I like simpler, more discoverable tools; e.g. we've got a bunch of
> > > > interesting stuff in scripts/ but it doesn't get used nearly as much -
> > > > not as accessible as cat'ing a file, definitely not going to be
> > > > installed by default.
> > >
> > > I also prefer plain bytes instead of MiB. A driver developer that
> > > wants to verify up-to the byte allocations for a new data structure
> > > that they added is going to be disappointed by the rounded MiB
> > > numbers.
> >
> > That's a fair point.
> >
> > > The data contained in this file is not consumable without at least
> > > "sort -h -r", so why not just output bytes instead?
> > >
> > > There is /proc/slabinfo  and there is a slabtop tool.
> > > For raw /proc/allocinfo we can create an alloctop tool that would
> > > parse, sort and show data in human readable format based on various
> > > criteria.
> > >
> > > We should also add at the top of this file "allocinfo - version: 1.0",
> > > to allow future extensions (i.e. column for proc name).
> >
> > How would we feel about exposing two different versions in /proc? It
> > should be a pretty minimal addition to .text.
> >
> > Personally, I hate trying to count long strings digits by eyeball...
>
> Maybe something like this work for everyone then?:

s/work/would work

making too many mistakes. time for bed...

>
> 160432128 (153MiB)     mm/slub.c:1826 module:slub func:alloc_slab_page

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ