On 02/08/2016 12:57 PM, Khalid Mughal (khalidm) wrote:
How do we explain the discrepancy between MemAvaiable and MemFree count after we drop cache? In following output, which one represents correct data? [Linux_0:/]$ cat /proc/meminfo MemTotal: 3977836 kB MemFree: 747832 kB MemAvailable: 1441736 kB Buffers: 123976 kB Cached: 1210272 kB Active: 2496932 kB Inactive: 585364 kB Active(anon): 2243932 kB Inactive(anon): 142676 kB Active(file): 253000 kB Inactive(file): 442688 kB Dirty: 44 kB AnonPages: 1748088 kB Mapped: 406512 kB Shmem: 638564 kB Slab: 65656 kB SReclaimable: 30120 kB SUnreclaim: 35536 kB KernelStack: 5920 kB PageTables: 19040 kB CommitLimit: 1988916 kB Committed_AS: 3765252 kB [Linux_0:/]$ echo 3 > /proc/sys/vm/drop_caches [Linux_0:/]$ cat /proc/meminfo MemTotal: 3977836 kB MemFree: 1095012 kB MemAvailable: 1434148 kB
I suspect MemAvailable takes into account more than just the droppable caches. For instance, reclaimable slab is included, but I don't think drop_caches drops that part.
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