Re: [External] Re: [RFC PATCH 1/3] zram: charge the compressed RAM to the page's memcgroup

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 15.06.23 14:19, 贺中坤 wrote:
On Thu, Jun 15, 2023 at 7:19 PM David Hildenbrand <david@xxxxxxxxxx> wrote:

Yes, but my point is that there are cases where the pages you get are
not charged. zram_bvec_write_partial() is just one such example that
highlights the issue.

Sorry ,I got it.

I suspect for the swap->zram we should always get charged pages, because we're effectively writing out charged anon/shmem pages only -- without any buffer in between.

For the fs->zram or direct zram access device case I'm not so sure. It highly depends on what gets mapped into the bio (e.g., a kernel buffer, zeropage, ...). If it's a pagecache page, that should be charged and we're good. No so sure about fs metadata or some other fs cases (e.g., write() to a file that bypass the pagecache).

--
Cheers,

David / dhildenb





[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux