github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 08:33:17 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

mm: introduce PF_MEMALLOC_NORECLAIM, PF_MEMALLOC_NOWARN

Browse Source 
Introduce PF_MEMALLOC_* equivalents of some GFP_ flags:

PF_MEMALLOC_NORECLAIM	-> GFP_NOWAIT
PF_MEMALLOC_NOWARN	-> __GFP_NOWARN

Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: linux-mm@kvack.org
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-01-25 19:00:24 -05:00
parent 3f6d5e6a46
commit eab0af905b
2 changed files with 15 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/sched.h
View File

@ -1636,8 +1636,8 @@ extern struct pid *cad_pid;
* I am cleaning dirty pages from some other bdi. */
#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
#define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
#define PF__HOLE__00800000 0x00800000
#define PF__HOLE__01000000 0x01000000
#define PF_MEMALLOC_NORECLAIM 0x00800000 /* All allocation requests will clear __GFP_DIRECT_RECLAIM */
#define PF_MEMALLOC_NOWARN 0x01000000 /* All allocation requests will inherit __GFP_NOWARN */
#define PF__HOLE__02000000 0x02000000
#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */

17
include/linux/sched/mm.h
View File

@ -236,16 +236,25 @@ static inline gfp_t current_gfp_context(gfp_t flags)
{
unsigned int pflags = READ_ONCE(current->flags);
if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS | PF_MEMALLOC_PIN))) {
if (unlikely(pflags & (PF_MEMALLOC_NOIO |
PF_MEMALLOC_NOFS |
PF_MEMALLOC_NORECLAIM |
PF_MEMALLOC_NOWARN |
PF_MEMALLOC_PIN))) {
/*
* NOIO implies both NOIO and NOFS and it is a weaker context
* so always make sure it makes precedence
* Stronger flags before weaker flags:
* NORECLAIM implies NOIO, which in turn implies NOFS
*/
if (pflags & PF_MEMALLOC_NOIO)
if (pflags & PF_MEMALLOC_NORECLAIM)
flags &= ~__GFP_DIRECT_RECLAIM;
else if (pflags & PF_MEMALLOC_NOIO)
flags &= ~(__GFP_IO | __GFP_FS);
else if (pflags & PF_MEMALLOC_NOFS)
flags &= ~__GFP_FS;
if (pflags & PF_MEMALLOC_NOWARN)
flags |= __GFP_NOWARN;
if (pflags & PF_MEMALLOC_PIN)
flags &= ~__GFP_MOVABLE;
}