David Howells <dhowe...@redhat.com> wrote:
> However, if both LRU discard and relinquishment happen *before* the SM
> runs, one of the queue events will get discarded, along with the ref that
> would be associated with it. The last ref is then discarded and the cookie
> is removed without completing the relinquishment process - leaving the
> cookie hashed.
This can be seen in a trace, e.g.:
kworker/u16:97-5939 [000] ..... 639.403740: fscache_cookie: c=000071a9 -
lrudo r=3
kworker/u16:97-5939 [000] ..... 639.403741: fscache_cookie: c=000071a9
GQ endac r=4
kworker/u16:97-5939 [000] ..... 639.403745: fscache_cookie: c=000071a9
PUT lru r=3
dirstress-7027 [002] ..... 639.427220: fscache_relinquish:
c=000071a9 V=00000001 r=3 U=0 f=bd rt=0
dirstress-7027 [002] ..... 639.427222: fscache_cookie: c=000071a9
GQ endac r=4
dirstress-7027 [002] ..... 639.427223: fscache_cookie: c=000071a9
PQ overq r=3
where the "overq" line marks the discarded event and ref.
David
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