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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 13 |
1 files changed, 1 insertions, 12 deletions
@@ -116,18 +116,6 @@ running the tests): ### Things to design -* Cache architecture : - - A RAM file is basically a bunch of pages that contain the data (rather than a segment of - malloc()'ed memory) - - A framebuffer device is basically a bunch of pages at a fixed hardware location, that cannot - grow - - In the two previous cases, the pages are never freed : they are not a cache, they are the - data itself. - - In the case of an on-disk file, the pages are a copy of the file's data that is originally - on-disk, and we might want to free these pages even while a process is using them, because - we can always reload them from the disk. - - An on-disk file with a page cache must be aware of all the places where the page is mapped, - so that it can unmap it when reclaiming pages. * Reclaiming physical memory : - Freeing some cached stuff, ie swapping pages from mmap regions - Swapping pages from processes non-mmap regions (ie real data regions) @@ -142,6 +130,7 @@ running the tests): ### Things not sure * VFS thread safety : is the design correct ? (probably) +* Cache architecture (called *pager*, after 4.4BSD terminology) * Not enough tests! ### Plans for the later future |