Re: [PATCH v2 2/2] task_mmu: Add user-space support for resetting mm->hiwater_rss (peak RSS)

From: Kirill A. Shutemov
Date: Wed Jan 07 2015 - 12:25:11 EST


On Wed, Jan 07, 2015 at 05:06:54PM +0000, Petr Cermak wrote:
> Peak resident size of a process can be reset by writing "5" to
> /proc/pid/clear_refs. The driving use-case for this would be getting the
> peak RSS value, which can be retrieved from the VmHWM field in
> /proc/pid/status, per benchmark iteration or test scenario.

And how it's not an ABI break?

We have never-lowering VmHWM for 9+ years. How can you know that nobody
expects this behaviour?

And why do you reset hiwater_rss, but not hiwater_vm?

--
Kirill A. Shutemov
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/