Messages in this thread | | | Subject | Re: [PATCH 1/6] swap: Add comments to lock_cluster_or_swap_info() | From | Dave Hansen <> | Date | Fri, 13 Jul 2018 03:48:28 -0700 |
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> +/* > + * At most times, fine grained cluster lock is sufficient to protect
Can we call out those times, please?
> + * the operations on sis->swap_map.
Please be careful with the naming. You can call it 'si' because that's what the function argument is named. Or, swap_info_struct because that's the struct name. Calling it 'sis' is a bit sloppy, no?
> No need to acquire gross grained
"coarse" is a conventional antonym for "fine".
> + * sis->lock. But cluster and cluster lock isn't available for HDD, > + * so sis->lock will be instead for them. > + */ > static inline struct swap_cluster_info *lock_cluster_or_swap_info( > struct swap_info_struct *si, > unsigned long offset)
What I already knew was: there are two locks. We use one sometimes and the other at other times.
What I don't know is why there are two locks, and the heuristics why we choose between them. This comment doesn't help explain the things I don't know.
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