-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 02/23/2013 10:58 PM, Zheng Liu wrote: > Hi Phillip, > > I think we need to initiate writeout. IIRC, when we try to free > pages, we would wait on page writeback. That will cause a huge > latency for Not really. Most writes are initiated by the flush kernel thread. The only way the old implementation would help applications avoid delays in writing was if it slowly writes just the right amount of data to use a significant amount of cache pages, but not quite enough for the kernel flush thread to start writing it out, and then suddenly tried to burst a lot of writes. > some applications. If these pages have been written out, we just > need to invalidate them. IMO we can move these pages to inactive > list and write them out. If you want to be sure writes start now, you should be using sync_file_range(). If you combine that with posix_fadvise, then you can be sure that writing starts now, and that the page cache will prefer to discard that data ahead of other cached pages. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iQEcBAEBAgAGBQJRKZE4AAoJEJrBOlT6nu75rmcIAIBmhok62teELHqDSLUA2Mj7 bEM10Iosghsq+QqH4kWq2U7S/eA935JVN2xKduQAL0/doO0+qTHIha40Fl9b7Q2D k17cush2Z26tk7qZcQ9zh1HKfKQ1mxReU7eSkdv7FWdkOo7DTA71yk/2Ej7Zuv+E 4Fl26HYhNQADK6t5Y1hyfpG+MebuTM/jFrfCD5RRO1cnDxrU8xK3NTEEmrooZsB1 buUfWE0Wfm9MaSvArft6YVMr0XJlCUEUwkV/0LDBGBQs+YjdawQ9wPYdNTLhiijP Y7HEZJe5Oi9mzeQNcr9QwGIqA4dSVW6XqiGDHLMDNanXhgnEhH1S3CmsZXL37OM= =JoEo -----END PGP SIGNATURE----- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>