lkml.org 
[lkml]   [2010]   [Jun]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[RFC][PATCH 0/1] kmemleak: Fix false positive with alias
Date
Hi,

This is another version of "kmemleak: Fix false positive", which
introduces another alias tree to keep track of all alias address of
each objects, based on the discussion(*1)

You can also find the previous one(*2), which uses special scan area
for alias addresses with a conversion function.

Compared with both methods, it seems that the current one takes a bit
longer to scan as below, tested with 512 elementes of (*3).

"kmemleak: Fix false positive with alias":
# time echo scan > /mnt/kmemleak
real 0m 8.40s
user 0m 0.00s
sys 0m 8.40s

"kmemleak: Fix false positive with special scan":
# time echo scan > /mnt/kmemleak
real 0m 3.96s
user 0m 0.00s
sys 0m 3.96s

For our case(*4) to reduce false positives for the 2nd level IOMMU
pagetable allocation, the previous special scan seems to be enough
lightweight, although there might be possiblity to improve alias
one and also I might misunderstand the original proposal of aliasing.

Any comment would be appreciated.

*1: http://lkml.org/lkml/2010/6/2/282
*2: kmemleak: Fix false positive with special scan
http://lkml.org/lkml/2010/6/1/137
*3: kmemleak: Add special scan test case
http://lkml.org/lkml/2010/6/1/134
*4: http://lkml.org/lkml/2010/6/1/136

Hiroshi DOYU (1):
kmemleak: Fix false positive with alias

include/linux/kmemleak.h | 4 +
mm/kmemleak.c | 198 ++++++++++++++++++++++++++++++++++++++--------
2 files changed, 168 insertions(+), 34 deletions(-)




\
 
 \ /
  Last update: 2010-06-18 08:07    [W:0.177 / U:0.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site