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[v5,bpf-next,2/5] mm: mempolicy: Revise comment regarding mempolicy mode flags

Message ID 20231214125033.4158-3-laoar.shao@gmail.com (mailing list archive)
State New
Headers show
Series mm, security, bpf: Fine-grained control over memory policy adjustments with lsm bpf | expand

Commit Message

Yafang Shao Dec. 14, 2023, 12:50 p.m. UTC 
MPOL_F_STATIC_NODES, MPOL_F_RELATIVE_NODES, and MPOL_F_NUMA_BALANCING are
mode flags applicable to both set_mempolicy(2) and mbind(2) system calls.
It's worth noting that MPOL_F_NUMA_BALANCING was initially introduced in
commit bda420b98505 ("numa balancing: migrate on fault among multiple bound
nodes") exclusively for set_mempolicy(2). However, it was later made a
shared flag for both set_mempolicy(2) and mbind(2) following
commit 6d2aec9e123b ("mm/mempolicy: do not allow illegal
MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()").

This revised version aims to clarify the details regarding the mode flags.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Eric Dumazet <edumazet@google.com>
---
 include/uapi/linux/mempolicy.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h
index a8963f7..afed4a4 100644
--- a/include/uapi/linux/mempolicy.h
+++ b/include/uapi/linux/mempolicy.h
@@ -26,7 +26,7 @@  enum {
 	MPOL_MAX,	/* always last member of enum */
 };
 
-/* Flags for set_mempolicy */
+/* Flags for set_mempolicy() or mbind() */
 #define MPOL_F_STATIC_NODES	(1 << 15)
 #define MPOL_F_RELATIVE_NODES	(1 << 14)
 #define MPOL_F_NUMA_BALANCING	(1 << 13) /* Optimize with NUMA balancing if possible */