diff options
Diffstat (limited to 'include/llfio/v2.0/utils.hpp')
| -rw-r--r-- | include/llfio/v2.0/utils.hpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/llfio/v2.0/utils.hpp b/include/llfio/v2.0/utils.hpp index 4b8501da..0abec3e8 100644 --- a/include/llfio/v2.0/utils.hpp +++ b/include/llfio/v2.0/utils.hpp @@ -253,8 +253,10 @@ namespace utils `process_memory_usage::want::private_committed_inaccurate` can yield significant performance gains. If you set `process_memory_usage::want::private_committed_inaccurate`, we use `/proc/pid/smaps_rollup` and `/proc/pid/maps` to calculate the results. This - cannot distinguish between regions with the accounted - flag enabled or disabled. By default, this fast path is enabled. + cannot distinguish between regions with the accounted flag enabled or disabled, and + be aware that glibc's `malloc()` for some inexplicable reason doesn't set the + accounted flag on regions it commits, so the inaccurate flag will always yield + higher numbers for private commited on Linux. By default, this fast path is enabled. \note `/proc/pid/smaps_rollup` was added in Linux kernel 3.16, so the default specifying `process_memory_usage::want::private_committed_inaccurate` will always fail on Linux |