X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=Documentation%2Fvm%2Fovercommit-accounting;h=9db560eba20395979d95610c09ff8dc3ff3c73d4;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=e0fd0b8f037aae48ce5e5acea377025e6d180da9;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git diff --git a/Documentation/vm/overcommit-accounting b/Documentation/vm/overcommit-accounting index e0fd0b8f0..9db560eba 100644 --- a/Documentation/vm/overcommit-accounting +++ b/Documentation/vm/overcommit-accounting @@ -1,4 +1,4 @@ -The Linux kernel supports three overcommit handling modes +The Linux kernel supports the following overcommit handling modes 0 - Heuristic overcommit handling. Obvious overcommits of address space are refused. Used for a typical system. It @@ -7,10 +7,10 @@ The Linux kernel supports three overcommit handling modes allocate slighly more memory in this mode. This is the default. -1 - No overcommit handling. Appropriate for some scientific +1 - Always overcommit. Appropriate for some scientific applications. -2 - (NEW) strict overcommit. The total address space commit +2 - Don't overcommit. The total address space commit for the system is not permitted to exceed swap + a configurable percentage (default is 50) of physical RAM. Depending on the percentage you use, in most situations @@ -27,7 +27,7 @@ Gotchas The C language stack growth does an implicit mremap. If you want absolute guarantees and run close to the edge you MUST mmap your stack for the -largest size you think you will need. For typical stack usage is does +largest size you think you will need. For typical stack usage this does not matter much but it's a corner case if you really really care In mode 2 the MAP_NORESERVE flag is ignored.