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SubjectRe: Linux 2.4.4-ac17
On Sat, 26 May 2001, Jaswinder Singh wrote:

> > The OS resides on disk, yes. I suppose I could plunk a minimal
> > system into ramfs, pivot_root and umount disk, but I don't see
> > any way that could matter for a memory leak.
> >
> It is very difficult to see memory leak , with hard disks .

It is very easy for me to see any leak which I can trigger. I'm using
a tool which tracks each any every allocation in the kernel. (a 1/32
scale model of physical memory with 'who allocated it, and when' tags)

> As i told you , in my case i am using no harddisks , only thing i have is
> RAM , so i am using only Ramdisk and ramfs, so in my case my Ram will full
> within few minutes and My machine hangs .

Exactly. Nothing but ram and it's mostly unfreeable. That makes
life pretty tough for the vm.

Does it hang if you are doing other things than creating/destroying
tiny files (with unique names) as rapidly as possible?.. ie did you
start doing that to troubleshoot because it was hanging over a long
period of time?

You snipped my suggestion.. did you try it? If not, please do. In
fact, go a bit further. Make unconditional calls to kmem_cache_reap()
and shrink_icache_memory() as well.. prior to calling page_launder().
It's a long shot, but it might help. If it does help, that will
tell developers what they need to know. It costs you five minutes.

Another option is to build 2.4.5-pre6 and add the patch Rik posted.
If my thinker is working right, that _will_ help (if not cure).

Another option which virtually guarantees successful identification
of the problem (but costs more than five minutes) is for you to grab
a copy of IKD from your favorite kernel mirror and give memleak a try
locally. It can be found in /pub/linux/kernel/people/andrea/ikd. If
you choose this option and have any trouble, drop me a note offline.


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