Messages in this thread | | | Date | Wed, 24 Sep 2008 02:48:29 +0900 (JST) | From | KOSAKI Motohiro <> | Subject | Re: [RFC] [PATCH -mm 0/2] memcg: per cgroup dirty_ratio |
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> Currently the problem we are hitting is that we cannot specify pdflush > to have background limits less than 1% of memory. I am currently > finishing up a patch right now that adds a dirty_ratio_millis > interface. I hope to submit the patch to LKML by the end of the week. > > The idea is that we don't want to break backwards compatibility and we > also don't want to have two conflicting knobs in the sysctl or > /proc/sys/vm/ space. I thought adding a new knob for those who want to > specify finer grained functionality was a compromise. So the patch has > a vm_dirty_ratio and a vm_dirty_ratio_millis interface. The first to > specify 0-100% and the second to specify .0 to .999%. > > So to represent 0.125% of RAM we set > vm_dirty_ratio = 0 > vm_dirty_ratio_millis = 125 > > The same for the background_ratio.
Why vm_dirty_ratio = 0.125 is wrong? it is hardly for parser maker, but it have nicer user experience.
> > I would also prefer using a bytes interface but I am not sure how to > offer that without either removing the legacy interface of the ratios > or by offering a concurrent interface that might be confusing such as > when users are looking at the old one and not aware of a new one. > > Any feedback?
Sure. We don't have any motivation of its interface change.
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