Linux 如何降低页面分配失败的概率？

当CONFIG-MIGRATION和CONFIG-compression都被禁用时，Linux内核是否可以使用一些方法来降低页面分配失败的概率

除了增加min_free_字节的值和执行

echo 2>/proc/sys/vm/drop_缓存之外，是否还有一些系统设置可以实现此目标

以下是页面分配失败的示例日志：

Hello: page allocation failure: order:9, mode:0x60c0c0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null)
Hello cpuset=/ mems_allowed=0
Mem-Info:
active_anon:56054 inactive_anon:109301 isolated_anon:0
 active_file:110190 inactive_file:91980 isolated_file:0
 unevictable:9375 dirty:1 writeback:0 unstable:0
 slab_reclaimable:22463 slab_unreclaimable:19122
 mapped:101678 shmem:25642 pagetables:7663 bounce:0
 free:456443 free_pcp:0 free_cma:0
Node 0 active_anon:224216kB inactive_anon:437204kB active_file:440760kB inactive_file:367920kB unevictable:37500kB isolated(anon):0kB isolated(file):0kB mapped:406712kB dirty:4kB writeback:0kB shmem:102568kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Node 0 DMA free:15892kB min:32kB low:44kB high:56kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15892kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]: 0 2804 3762 3762
Node 0 DMA32 free:1798624kB min:5836kB low:8704kB high:11572kB active_anon:188040kB inactive_anon:219400kB active_file:184156kB inactive_file:346776kB unevictable:24900kB writepending:0kB present:3017476kB managed:2927216kB mlocked:24900kB kernel_stack:1712kB pagetables:7564kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]: 0 0 958 958
Node 0 Normal free:11256kB min:1992kB low:2972kB high:3952kB active_anon:36084kB inactive_anon:218100kB active_file:257220kB inactive_file:21148kB unevictable:12600kB writepending:4kB present:1048576kB managed:981268kB mlocked:12600kB kernel_stack:5280kB pagetables:23088kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 3*4kB (U) 3*8kB (U) 1*16kB (U) 1*32kB (U) 3*64kB (U) 0*128kB 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15892kB
Node 0 DMA32: 14912*4kB (UME) 13850*8kB (UME) 9325*16kB (UME) 5961*32kB (UME) 3622*64kB (UME) 2359*128kB (UME) 1128*256kB (UME) 524*512kB (M) 194*1024kB (UM) 0*2048kB 0*4096kB = 1799872kB
Node 0 Normal: 1643*4kB (UME) 71*8kB (UME) 47*16kB (UM) 35*32kB (M) 38*64kB (M) 1*128kB (M) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 11572kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
232507 total pagecache pages
7 pages in swap cache
Swap cache stats: add 1015, delete 1008, find 0/1
Free swap  = 995068kB
Total swap = 999420kB
1020511 pages RAM
0 pages HighMem/MovableOnly
39417 pages reserved
0 pages hwpoisoned

您可以使用vm.min_free_kbytes，它告诉内核在任何情况下都要保持这样的内存空闲（单位为kB）

文件：

要永久更改此设置，您可以执行以下操作（降低到16MB）：

要玩游戏并测试所有功能，您可以仅为当前会话更改它：

sysctl -w vm.min_free_kbytes=16384

信息来源是kernel.org。
感谢您的澄清。但老实说，这不是一个好方法。首先，不容易找到最小空闲字节的合适值。其次，正如前面提到的问题，不要试图设置这个值。还是要感谢你。
echo "vm.min_free_kbytes=16384" >> /etc/sysctl.conf

sysctl -w vm.min_free_kbytes=16384