Messages in this thread | | | From | Adam Romanek <> | Subject | tmpfs - what portion of a tmpfs partition is swapped out | Date | Fri, 15 Mar 2019 07:30:16 +0100 |
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Hi,
I have an embedded platform running Linux 3.12.x with rootfs uncompressed to RAM and using a tmpfs partition. I also use ZRAM on this platform, so I expect parts of the root filesystem to get swapped out over time. I'm struggling with poor performance which I believe is somehow related to swapping. I'm able to measure the number of pages swapped in and out, I'm also able to measure the amount of swapped memory for user-space processes (thanks to Android's procrank tool).
Now in order to fully understand what happens within the system I'd like to measure what portion of the root filesystem is swapped to ZRAM.
I found that include/linux/shmem_fs.h contains 'struct shmem_inode_info' which on the other hand contains 'swapped' field. If I'm correct then iterating over all inodes from the root filesystem and summing up the values of this field should provide me with the result. Is that correct?
I'm not a regular Linux kernel developer so any help on implementing this would be appreciated.
Best regards, Adam Romanek
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