-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 4/16/2014 1:44 PM, Zuckerman, Boris wrote: > Typically File System services do not offer semantics of > transactional isolation. Attempts to add that took place and were > rejected. Therefore, we are speaking only about some potential > performance penalty, right? Not at all. This has nothing to do with transactions; it is simply a question of being able to identify what process is causing all of the disk IO, like via iotop. By counting writes in the process that initiates the writeout of dirty pages, rather than the process that dirties the page, it renders the write io tracking largely inaccurate to the point of being useless at times, since often the process dirtying the pages, even with an actual write() system call, is not the process that initiates the writeout. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTTslkAAoJEI5FoCIzSKrwb4MH/AzwLC8GXD0huUYsU7xqEIDj ZciTTSFMVTXa47tK8jIIbPLW3vTHyf0Dm/F1rnjn8jnJwhSqnVFfYKfUTrNQy/ze 7hJQXZ2oORZxp7jwPo3bHR1Oir0T1yXQdE5Ao7/W6wWCXY+JHEEvK1nyCPIClq+T 7TCLbkA3L0qHlGpaJMU7FkE9VaT2EI/8SKrQ05Hy2pLcksiAePnerFvxgCGIjSGU uSXPEqamzl42eqU6pyTdTMM7yJDyIhluCH02he7y56tCX7IU5oEG6LYsDYKfsVLd mEQeO2gCwcgKSrSQsjguPwTC5vyaomrYWvFt37jvvBWjcQwWj7A/kX6N9SBQOqY= =4zjT -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
