Add the S/s JEMALLOC_OPTIONS flags to enable/disable tcache bin sorting.

1 files changed, 9 insertions, 0 deletions

diff --git a/jemalloc/doc/jemalloc.3.in b/jemalloc/doc/jemalloc.3.in
index efe773b..f55325e 100644
--- a/jemalloc/doc/jemalloc.3.in
+++ b/jemalloc/doc/jemalloc.3.in
@@ -312,6 +312,15 @@ Double/halve the size of the maximum size class that is a multiple of the
 quantum (8 or 16 bytes, depending on architecture).
 Above this size, cacheline spacing is used for size classes.
 The default value is 128 bytes.
+@roff_tcache@.It S
+@roff_tcache@Sort the objects of a particular size class that are stored in a
+@roff_tcache@thread-specific cache just before flushing some of them from the
+@roff_tcache@cache, such that the objects highest in memory are preferentially
+@roff_tcache@freed.
+@roff_tcache@This tends to reduce fragmentation, but sorting is (n lg n), and in
+@roff_tcache@practice it is expensive enough to have a moderate performance
+@roff_tcache@impact.
+@roff_tcache@This option is enabled by default.
 @roff_trace@.It T
 @roff_trace@Write a verbose trace log to a set of files named according to the
 @roff_trace@pattern