Hi, I'm updating the autofs version in Ubuntu from 5.1.2 to 5.1.5, and as part of that process was looking over the patches we are carrying. I found this one: Author: Joel Ebel <jbebel@xxxxxxxxxx> Bug-Ubuntu: https://launchpad.net/bugs/591100 Description: Increase group buffer size geometrically rather than linearly when its found to be small. . This prevents package to eat the cpu if you have large groups. --- a/lib/mounts.c +++ b/lib/mounts.c @@ -1245,7 +1245,7 @@ status = getgrgid_r(gid, pgr, gr_tmp, tmplen, ppgr); if (status != ERANGE) break; - tmplen += grplen; + tmplen *= 2; } if (status || !pgr) { That came from https://bugs.launchpad.net/ubuntu/+source/autofs5/+bug/591100, and the intention is to speed up the scenario where a user belongs to thousands of groups. grplen is 1024, and looping over getgrgid_r() hundreds of times took a while of high CPU usage. The patch doesn't apply cleanly anymore, but the tmplen+=grplen code is still there. Would upstream be interested in adopting this change, or something like it? Cheers
