On Wed, Dec 20, 2017 at 04:57:28PM -0800, Linus Torvalds wrote:
> On Wed, Dec 20, 2017 at 2:45 PM, NeilBrown wrote:
> >
> > We could just leave the code unchanged, but apart from that being
> > potentially confusing, the (unfair) bit-spin-lock which protects
> > s_anon can become a bottle neck whe
On Wed, Dec 20, 2017 at 2:45 PM, NeilBrown wrote:
>
> We could just leave the code unchanged, but apart from that being
> potentially confusing, the (unfair) bit-spin-lock which protects
> s_anon can become a bottle neck when lots of disconnected dentries are
> being created.
>
> So this patch ren
On Thu, Dec 21, 2017 at 09:45:40AM +1100, NeilBrown wrote:
> -c/ Helper routines to allocate anonymous dentries, and to help attach
> + prefix. If the refcount on a dentry with this flag set
> + becomes zero, the dentry is immediately discarded, rather than being
> + kept in the dcache. If
On Wed, Dec 20 2017, Matthew Wilcox wrote:
> On Thu, Dec 21, 2017 at 09:45:40AM +1100, NeilBrown wrote:
>> -c/ Helper routines to allocate anonymous dentries, and to help attach
>> + prefix. If the refcount on a dentry with this flag set
>> + becomes zero, the dentry is immediately discarded,
On Thu, Dec 21, 2017 at 09:45:40AM +1100, NeilBrown wrote:
> -c/ Helper routines to allocate anonymous dentries, and to help attach
> + prefix. If the refcount on a dentry with this flag set
> + becomes zero, the dentry is immediately discarded, rather than being
> + kept in the dcache. If
The original purpose of the per-superblock d_anon list was to
keep disconnected dentries in the cache between consecutive
requests to the NFS server. Dentries can be disconnected if
a client holds a file open and repeatedly performs IO on it,
and if the server drops the dentry, whether due to mem
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