Re: [PATCH RFC 1/8] dcache: show count of hash buckets in sysctl fs.dentry-state

Waiman Long
2020-05-08T14:49:49Z

On 5/8/20 8:23 AM, Konstantin Khlebnikov wrote:
> Count of buckets is required for estimating average length of hash chains.
> Size of hash table depends on memory size and printed once at boot.
>
> Let's expose nr_buckets as sixth number in sysctl fs.dentry-state

The hash bucket count is a constant determined at boot time. Is there a
need to use up one dentry_stat entry for that? Besides one can get it by
looking up the kernel dmesg log like:

[    0.055212] Dentry cache hash table entries: 8388608 (order: 14,
67108864 bytes)

Cheers,
Longman