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​loop  shuo.tian

=B7=A2=BC=FE=C8=CB: Hyeon= ggon Yoo <42.hyeyoo@gmail.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2024=C4=EA9=D4=C227=C8=D5 16:01
=CA=D5=BC=FE=C8=CB: zhang fangzheng
=B3=AD=CB=CD: Vlastimil Babka; =D5=C5=B7=BD=D5=FD (Fangzheng Zhang);= Christoph Lameter; Pekka Enberg; David Rientjes; Joonsoo Kim; Andrew Morto= n; Roman Gushchin; Greg KH; linux-mm@kvack.org; linux-kernel@vger.kernel.or= g; tkjos@google.com; =BA=AB=D3=F1=C3=F7 (Yuming Han); Suren Baghdasaryan; Kent Overstreet
=D6=F7=CC=E2: Re: [PATCH 0/2] Introduce panic function when slub lea= ks
 

=D7=A2=D2=E2: =D5=E2=B7=E2=D3=CA=BC=FE=C0=B4=D7=D4=D3=DA=CD=E2=B2=BF=A1=A3= =B3=FD=B7=C7=C4=E3=C8=B7=B6=A8=D3=CA=BC=FE=C4=DA=C8=DD=B0=B2=C8=AB=A3=AC=B7= =F1=D4=F2=B2=BB=D2=AA=B5=E3=BB=F7=C8=CE=BA=CE=C1=B4=BD=D3=BA=CD=B8=BD=BC=FE= =A1=A3
CAUTION: This email originated from outside of the organization. Do not cli= ck links or open attachments unless you recognize the sender and know the c= ontent is safe.



On Fri, Sep 27, 2024 at 4:28 PM zhang fangzheng
<fangzheng.zhang1003@gmail.com> wrote:
>
> On Thu, Sep 26, 2024 at 8:30 PM Vlastimil Babka <vbabka@suse.= cz> wrote:
> >
> > On 9/25/24 15:18, Hyeonggon Yoo wrote:
> > > On Wed, Sep 25, 2024 at 12:23 PM Fangzheng Zhang
> > > <fangzheng.zhang@unisoc.com> wrote:
> > >>
> > >> Hi all,
> > >
> > > Hi Fangzheng,
> > >
> > >> A method to detect slub leaks by monitoring its usage in= real time
> > >> on the page allocation path of the slub. When the slub o= ccupancy
> > >> exceeds the user-set value, it is considered that the sl= ub is leaking
> > >> at this time
> > >
> > > I'm not sure why this should be a kernel feature. Why not wr= ite a user
> > > script that parses
> > > MemTotal: and Slab: part of /proc/meminfo file and generates= a log
> > > entry or an alarm?
> >
> > Yes very much agreed. It seems rather arbitrary. Why slab, why no= t any other
> > kernel-specific counter in /proc/meminfo? Why include NR_SLAB_REC= LAIMABLE_B
> > when that's used by caches with shrinkers?
>
> Ok, this is because the current consideration is to specifically
> track the memory usage of the slab module.
> In the stability test, ie, monkey test,
> the anr or reboot problem occurs, there is a high probability
> that the slab occupancy is high when it comes to memory analysis.
> In addition to directly monitoring leaks in the allocation path, it is=
> also convenient to record the allocation stack information
> when an exception occurs.

[+Cc Memory Allocation Profiling maintainers]

For recording allocation information, I think CONFIG_MEM_ALLOC_PROFILING [1= ] [2]
may be used to track allocation sites that contribute to memory leaks,
instead of making the kernel panic or printing WARNING?

.....Or with higher overhead, slub_debug=3DU [3] if it is not meant to
be run on production.

[1] https:= //docs.kernel.org/mm/allocation-profiling.html
[2] https://lwn.net/Articles/97= 4380
[3] https://docs.kernel.org/mm/slub.html#debugfs-files-for-slub

Best,
Hyeonggon

> > A userspace solution should be straightforward and universal - ea= sily
> > configurable for different scenarios.
> >
> > >> and a panic operation will be triggered immediately.
> > >
> > > I don't think it would be a good idea to panic unnecessarily= .
> > > IMO it is not proper to panic when the kernel can still run.=
> >
> > Yes these days it's practically impossible to add a BUG_ON() for = more
> > serious conditions than this.
> >
> > Please don't post new versions addressing specific implementation= details
> > until this fundamental issue is addressed.
> >
> > Thanks,
> > Vlastimil
> >
> > > Any thoughts?
> > >
> > > Thanks,
> > > Hyeonggon
> >
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