documentation: Document cache.diff_intraline

This cache was added in an earlier version of Gerrit, but was not
covered in the documentation.

Change-Id: Iec90f07449d50b9033c4925c1b3f372c5aea1cf7
Signed-off-by: Shawn O. Pearce <sop@google.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index bebce29de2..11bba6e93a 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -288,6 +288,7 @@ Default is 1024 for most caches, except:
 +
 * `"adv_bases"`: default is `4096`
 * `"diff"`: default is `128`
+* `"diff_intraline"`: default is `128`
 
 [[cache.name.diskLimit]]cache.<name>.diskLimit::
 +
@@ -357,6 +358,21 @@ Keeping entries for 90 days gives sufficient time for most changes
 to be submitted or abandoned before their relevant difference items
 expire out.
 
+cache `"diff_intraline"`::
++
+Each item caches the intraline difference of one file, when compared
+between two commits. Gerrit uses this cache to accelerate display of
+intraline differences when viewing a file.
++
+Entries in this cache are relatively large, so the memory limit
+should not be set incredibly high.  Administrators should try to
+target cache.diff.memoryLimit to be roughly the number of changes
+which their users will process in a 1 or 2 day span.
++
+Keeping entries for 90 days gives sufficient time for most changes
+to be submitted or abandoned before their relevant difference items
+expire out.
+
 cache `"groups"`::
 +
 Caches the basic group information from the `account_groups` table,