adding some smartness in file cache

[Conrad Meyer]

Consider modifying your linear scan programs to use posix_fadvise(2)
POSIX_FADV_DONTNEED and/or POSIX_FADV_NOREUSE.

You're right that we could be a bit more clever than straight LRU for
eviction (if we are not already), such as incorporating some hybrid
scoring using MRU/LFU/RR-like eviction policies.  Your proposal is an
extremely specific MRU heuristic.

On Sun, Jan 12, 2020 at 4:21 AM Wojciech Puchar <wojtek at puchar.net> wrote:
>
> FreeBSD uses unified cache which is generally great but have some
> disadventages.
>
> One common is case of linear reading or writing of large files.
> This wipes out other things from memory very quickly.
>
> Can cache be made to drop every full block (MAXPHYS) from cache instantly
> after is fully read by user program or  is wrote to disk.
>
> This way memory would be much better utilized in caching small I/O.
>
>
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