最后留的问题做的实验。看的下面的评论，我自己使用的bcc cachetop，但看结果毫无变化
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| # cachetop #使用了echo 3 >/proc/sys/vm/drop_caches，但结果一直是下面的情况
09:50:57 Buffers MB: 6202 / Cached MB: 386 / Sort: HITS / Order: ascending
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| root@perf:/home/ykg# echo 3 >/proc/sys/vm/drop_caches
root@perf:/home/ykg# slabtop -o -s c
Active / Total Objects (% used) : 386384 / 421424 (91.7%)
Active / Total Slabs (% used) : 7718 / 7718 (100.0%)
Active / Total Caches (% used) : 100 / 142 (70.4%)
Active / Total Size (% used) : 104914.02K / 113871.35K (92.1%)
Minimum / Average / Maximum Object : 0.01K / 0.27K / 8.00K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
32192 32192 100% 0.50K 503 64 16096K kmalloc-512
25917 23940 0% 0.59K 489 53 15648K inode_cache
76740 74058 0% 0.13K 1279 60 10232K kernfs_node_cache
41244 31900 0% 0.19K 982 42 7856K dentry
600 587 0% 8.00K 150 4 4800K kmalloc-8192
7616 6548 0% 0.57K 136 56 4352K radix_tree_node
16640 14915 0% 0.25K 260 64 4160K filp
3780 2743 0% 1.06K 126 30 4032K ext4_inode_cache
625 528 0% 5.75K 125 5 4000K task_struct
3200 2991 0% 1.00K 100 32 3200K kmalloc-1024
15249 14950 0% 0.20K 391 39 3128K vm_area_struct
4560 3949 0% 0.66K 95 48 3040K proc_inode_cache
1344 1316 0% 2.00K 84 16 2688K kmalloc-2048
592 559 0% 4.00K 74 8 2368K kmalloc-4096
2806 2761 0% 0.69K 61 46 1952K sock_inode_cache
2714 2422 0% 0.70K 59 46 1888K shmem_inode_cache
1664 1664 100% 1.00K 52 32 1664K UNIX
root@perf:/home/ykg# find / -name file-name
root@perf:/home/ykg# slabtop -o -s c
Active / Total Objects (% used) : 577221 / 601088 (96.0%)
Active / Total Slabs (% used) : 11750 / 11750 (100.0%)
Active / Total Caches (% used) : 100 / 142 (70.4%)
Active / Total Size (% used) : 173855.90K / 181403.00K (95.8%)
Minimum / Average / Maximum Object : 0.01K / 0.30K / 8.00K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
25770 24847 0% 1.06K 859 30 27488K ext4_inode_cache
35881 34367 0% 0.59K 677 53 21664K inode_cache
31296 30755 0% 0.66K 652 48 20864K proc_inode_cache
106050 97548 0% 0.19K 2525 42 20200K dentry
32192 32192 100% 0.50K 503 64 16096K kmalloc-512
76740 74058 0% 0.13K 1279 60 10232K kernfs_node_cache
6591 6396 0% 0.81K 169 39 5408K fuse_inode
600 587 0% 8.00K 150 4 4800K kmalloc-8192
7896 6828 0% 0.57K 141 56 4512K radix_tree_node
16768 15224 0% 0.25K 262 64 4192K filp
625 528 0% 5.75K 125 5 4000K task_struct
31395 31395 100% 0.10K 805 39 3220K buffer_head
3200 2991 0% 1.00K 100 32 3200K kmalloc-1024
15366 15067 0% 0.20K 394 39 3152K vm_area_struct
1344 1316 0% 2.00K 84 16 2688K kmalloc-2048
592 559 0% 4.00K 74 8 2368K kmalloc-4096
2806 2761 0% 0.69K 61 46 1952K sock_inode_cache
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