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nexedi
linux
Commits
36c9ea98
Commit
36c9ea98
authored
Jun 03, 2013
by
Kent Overstreet
Committed by
Kent Overstreet
Jul 01, 2013
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bcache: Document shrinker reserve better
Signed-off-by:
Kent Overstreet
<
kmo@daterainc.com
>
parent
e49c7c37
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drivers/md/bcache/btree.c
drivers/md/bcache/btree.c
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drivers/md/bcache/btree.c
View file @
36c9ea98
...
...
@@ -622,6 +622,13 @@ static int bch_mca_shrink(struct shrinker *shrink, struct shrink_control *sc)
else
if
(
!
mutex_trylock
(
&
c
->
bucket_lock
))
return
-
1
;
/*
* It's _really_ critical that we don't free too many btree nodes - we
* have to always leave ourselves a reserve. The reserve is how we
* guarantee that allocating memory for a new btree node can always
* succeed, so that inserting keys into the btree can always succeed and
* IO can always make forward progress:
*/
nr
/=
c
->
btree_pages
;
nr
=
min_t
(
unsigned
long
,
nr
,
mca_can_free
(
c
));
...
...
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