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Kernel: Implement O_DIRECT open() flag to bypass disk caches

Files opened with O_DIRECT will now bypass the disk cache in read/write
operations (though metadata operations will still hit the disk cache.)

This will allow us to test actual disk performance instead of testing
disk *cache* performance, if that's what we want. :^)

There's room for improvment here, we're very aggressively flushing any
dirty cache entries for the specific block before reading/writing that
block. This is done by walking the entire cache, which may be slow.
This commit is contained in:
Andreas Kling 2019-11-05 19:35:12 +01:00
parent 3de3daf765
commit 59ed235c85
7 changed files with 59 additions and 18 deletions

View file

@ -24,6 +24,7 @@
#define O_DIRECTORY 00200000
#define O_NOFOLLOW 00400000
#define O_CLOEXEC 02000000
#define O_DIRECT 04000000
#define O_NOFOLLOW_NOERROR 0x4000000
class Custody;