Re: [RFC] /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_overcommit_hugepages

[CAI Qian <caiqian@redhat.com>]

----- Original Message -----
> On Wed 05-01-11 10:36:47, CAI Qian wrote:
> > From f90b54f9f5607128e375bd78d21e751c433b3cf6 Mon Sep 17 00:00:00
> > 2001
> > From: CAI Qian <caiqian@redhat.com>
> > Date: Wed, 5 Jan 2011 23:26:57 +0800
> > Subject: [PATCH] hugetlbfs: check invalid nr_hugepages and
> > nr_overcommit_hugepages
> >
> > First, nr_*hugepages* in procfs and sysfs do not check for invalid
> > input like "". Second, when using oversize pages, nr_*hugepages* are
> > expected to be allocated during boot time. Therefore, return -EINVAL
> > for those cases.
> 
> I think that the two things should be split into two patches - one for
> the proper input data handling and the other one for the size check.
> Albeit, I am not sure about the size check because this is a thing
> that is just a current implementation limitation and can be change later.
OK, will do two patches.

> > Signed-off-by: CAI Qian <caiqian@redhat.com>
> > ---
> >  fs/sysfs/file.c | 2 ++
> >  mm/hugetlb.c | 18 ++++++++++++++++--
> >  2 files changed, 18 insertions(+), 2 deletions(-)
> >
> > diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
> > index da3fefe..9f4ea67 100644
> > --- a/fs/sysfs/file.c
> > +++ b/fs/sysfs/file.c
> > @@ -207,6 +207,8 @@ flush_write_buffer(struct dentry * dentry,
> > struct sysfs_buffer * buffer, size_t
> >  		return -ENODEV;
> >
> >  	rc = ops->store(kobj, attr_sd->s_attr.attr, buffer->page, count);
> > + if (!rc)
> > + return -EINVAL;
> 
> This doesn't look correct, you would imbalance sysfs_{get,put}_active.
Right, I'll fix this up.

Thanks.

CAI Qian

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