Many thanks for kind replies. You said inode cache is never swapped at all. In other words, the inode cache pages are not swappable. How do you know the pages are never swapped out? How can I tell whether a specific memory page is swappable? Can you point me to the right place in the kernel so that I can see more details? If my understanding is right, inode cache shrinker only frees the reclaimable inodes, which means, if a lot of files are opened when shrinker is activated, the shrinker may not find sufficient reclaimable inodes to free enough space. What will Linux do under such condition? Xin On 8/3/06, Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx> wrote:
> > Specifically, how a swaping system determine which page should be > swapped out when memory is tight? LRU, f.ex. > Intuitively, I think inode cache > pages should be swapped out as late as possible. I believe they are not swapped at all - they are shrunk when memory becomes a premium. (If this was a math class I'd say the cache size will be zero, although that's not too realistic in practice) > But how Linux mkae > decision on this? Why linux does not pin inode pages in the memory? Ugh hell no. Then you could trigger OOM by simply walking a big filesystem. Jan Engelhardt --
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