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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-13 10:19:27 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-31 13:00:42 +0100 |
| commit | db0afb54648e42e764aae6ee94dafaa581b13497 (patch) | |
| tree | 7e21d07ce3c2f87672db550720ae5ada6948adad /man2 | |
| parent | ddd5c503e8bc0a2b332bd75e3a56ea968f3fdf4f (diff) | |
| download | man-pages-db0afb54648e42e764aae6ee94dafaa581b13497.tar.gz | |
mbind.2: Memory policy is a per-thread attribute, not a per-process attribute
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man2')
| -rw-r--r-- | man2/mbind.2 | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/man2/mbind.2 b/man2/mbind.2 index 07fefec608..861b5ecd89 100644 --- a/man2/mbind.2 +++ b/man2/mbind.2 @@ -74,16 +74,16 @@ page in the kernel containing all zeros. For a file mapped with .BR MAP_PRIVATE , an initial read access will allocate pages according to the -process policy of the process that causes the page to be allocated. -This may not be the process that called +memory policy of the thread that causes the page to be allocated. +This may not be the thread that called .BR mbind (). The specified policy will be ignored for any .B MAP_SHARED mappings in the specified memory range. -Rather the pages will be allocated according to the process policy -of the process that caused the page to be allocated. -Again, this may not be the process that called +Rather the pages will be allocated according to the memory policy +of the thread that caused the page to be allocated. +Again, this may not be the thread that called .BR mbind (). If the specified memory range includes a shared memory region @@ -145,15 +145,15 @@ A nonempty specifies physical node IDs. Linux does not remap the .I nodemask -when the process moves to a different cpuset context, -nor when the set of nodes allowed by the process's +when the thread moves to a different cpuset context, +nor when the set of nodes allowed by the thread's current cpuset context changes. .TP .BR MPOL_F_RELATIVE_NODES " (since Linux-2.6.26)" A nonempty .I nodemask specifies node IDs that are relative to the set of -node IDs allowed by the process's current cpuset. +node IDs allowed by the thread's current cpuset. .PP .I nodemask points to a bit mask of nodes containing up to @@ -177,7 +177,7 @@ argument is ignored. Where a .I nodemask is required, it must contain at least one node that is on-line, -allowed by the process's current cpuset context +allowed by the thread's current cpuset context (unless the .B MPOL_F_STATIC_NODES mode flag is specified), @@ -193,10 +193,10 @@ mode requests that any nondefault policy be removed, restoring default behavior. When applied to a range of memory via .BR mbind (), -this means to use the process policy, +this means to use the thread memory policy, which may have been set with .BR set_mempolicy (2). -If the mode of the process policy is also +If the mode of the thread memory policy is also .BR MPOL_DEFAULT , the system-wide default policy will be used. The system-wide default policy allocates @@ -267,13 +267,13 @@ If the "local node" is low on free memory, the kernel will try to allocate memory from other nodes. The kernel will allocate memory from the "local node" whenever memory for this node is available. -If the "local node" is not allowed by the process's current cpuset context, +If the "local node" is not allowed by the thread's current cpuset context, the kernel will try to allocate memory from other nodes. The kernel will allocate memory from the "local node" whenever -it becomes allowed by the process's current cpuset context. +it becomes allowed by the thread's current cpuset context. By contrast, .B MPOL_DEFAULT -reverts to the policy of the process (which may be set via +reverts to the memory policy of the thread (which may be set via .BR set_mempolicy (2)); that policy may be something other than "local allocation". .PP @@ -312,7 +312,7 @@ is passed in .IR flags , then the kernel will attempt to move all existing pages in the memory range regardless of whether other processes use the pages. -The calling process must be privileged +The calling thread must be privileged .RB ( CAP_SYS_NICE ) to use this flag. If @@ -382,7 +382,7 @@ specifies one or more node IDs that are greater than the maximum supported node ID. Or, none of the node IDs specified by .I nodemask -are on-line and allowed by the process's current cpuset context, +are on-line and allowed by the thread's current cpuset context, or none of the specified nodes contain memory. Or, the .I mode @@ -439,14 +439,14 @@ When .B MPOL_DEFAULT is specified for .BR set_mempolicy (2), -the process's policy reverts to system default policy +the thread's memory policy reverts to the system default policy or local allocation. When .B MPOL_DEFAULT is specified for a range of memory using .BR mbind (), any pages subsequently allocated for that range will use -the process's policy, as set by +the thread's memory policy, as set by .BR set_mempolicy (2). This effectively removes the explicit policy from the specified range, "falling back" to a possibly nondefault |