ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 20:51:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

sched/numa: implement access PID reset logic

Browse Source 
This helps to ensure that only recently accessed PIDs scan the VMAs.

Current implementation: (idea supported by PeterZ)

 1. Accessing PID information is maintained in two windows. 
    access_pids[1] being newest.

 2. Reset old access PID info i.e.  access_pid[0] every (4 *
    sysctl_numa_balancing_scan_delay) interval after initial scan delay
    period expires.

The above interval seemed to be experimentally optimum since it avoids
frequent reset of access info as well as helps clearing the old access
info regularly.  The reset logic is implemented in scan path.

Link: https://lkml.kernel.org/r/f7a675f66d1442d048b4216b2baf94515012c405.1677672277.git.raghavendra.kt@amd.com
Signed-off-by: Raghavendra K T <raghavendra.kt@amd.com>
Suggested-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Bharata B Rao <bharata@amd.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Disha Talreja <dishaa.talreja@amd.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Raghavendra K T
2023-03-01 17:49:02 +05:30
committed by Andrew Morton
parent fc137c0dda
commit 20f586486b
3 changed files with 25 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/mm.h
View File

@@ -1692,8 +1692,8 @@ static inline void vma_set_access_pid_bit(struct vm_area_struct *vma)
unsigned int pid_bit;
pid_bit = current->pid % BITS_PER_LONG;
if (vma->numab_state && !test_bit(pid_bit, &vma->numab_state->access_pids)) {
__set_bit(pid_bit, &vma->numab_state->access_pids);
if (vma->numab_state && !test_bit(pid_bit, &vma->numab_state->access_pids[1])) {
__set_bit(pid_bit, &vma->numab_state->access_pids[1]);
}
}
#else /* !CONFIG_NUMA_BALANCING */