diff options
Diffstat (limited to 'Documentation/sysctl/vm.txt')
-rw-r--r-- | Documentation/sysctl/vm.txt | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 187ce4f599a2..749322060f10 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -61,6 +61,7 @@ Currently, these files are in /proc/sys/vm: - stat_refresh - numa_stat - swappiness +- unprivileged_userfaultfd - user_reserve_kbytes - vfs_cache_pressure - watermark_boost_factor @@ -237,7 +238,7 @@ used: cat (1234): drop_caches: 3 These are informational only. They do not mean that anything is wrong -with your system. To disable them, echo 4 (bit 3) into drop_caches. +with your system. To disable them, echo 4 (bit 2) into drop_caches. ============================================================== @@ -818,6 +819,17 @@ The default value is 60. ============================================================== +unprivileged_userfaultfd + +This flag controls whether unprivileged users can use the userfaultfd +system calls. Set this to 1 to allow unprivileged users to use the +userfaultfd system calls, or set this to 0 to restrict userfaultfd to only +privileged users (with SYS_CAP_PTRACE capability). + +The default value is 1. + +============================================================== + - user_reserve_kbytes When overcommit_memory is set to 2, "never overcommit" mode, reserve @@ -866,14 +878,14 @@ The intent is that compaction has less work to do in the future and to increase the success rate of future high-order allocations such as SLUB allocations, THP and hugetlbfs pages. -To make it sensible with respect to the watermark_scale_factor parameter, -the unit is in fractions of 10,000. The default value of 15,000 means -that up to 150% of the high watermark will be reclaimed in the event of -a pageblock being mixed due to fragmentation. The level of reclaim is -determined by the number of fragmentation events that occurred in the -recent past. If this value is smaller than a pageblock then a pageblocks -worth of pages will be reclaimed (e.g. 2MB on 64-bit x86). A boost factor -of 0 will disable the feature. +To make it sensible with respect to the watermark_scale_factor +parameter, the unit is in fractions of 10,000. The default value of +15,000 on !DISCONTIGMEM configurations means that up to 150% of the high +watermark will be reclaimed in the event of a pageblock being mixed due +to fragmentation. The level of reclaim is determined by the number of +fragmentation events that occurred in the recent past. If this value is +smaller than a pageblock then a pageblocks worth of pages will be reclaimed +(e.g. 2MB on 64-bit x86). A boost factor of 0 will disable the feature. ============================================================= |