GGLinnk/bees
1
0
Fork 0
mirror of https://github.com/Zygo/bees.git synced 2025-07-07 02:42:27 +02:00
Code Packages Activity

hash: use POSIX_FADV_WILLNEED and POSIX_FADV_DONTNEED

Browse Source 
The hash table is one of the few cases in bees where a non-trivial amount
of page cache memory will be used in a predictable way, so we can advise
the kernel about our IO demands in advance.

Use WILLNEED to prefetch hash table pages at startup.

Use DONTNEED to trigger writeback on hash table pages at shutdown.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2021-06-22 22:13:22 -04:00
parent 97d70ef4c5
commit a353d8cc6e
3 changed files with 49 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/bees.cc
View File

@ -252,6 +252,16 @@ bees_readahead(int const fd, off_t offset, size_t size)
BEESCOUNTADD(readahead_ms, readahead_timer.age() * 1000);
}
void
bees_unreadahead(int const fd, off_t offset, size_t size)
{
Timer unreadahead_timer;
BEESNOTE("unreadahead " << name_fd(fd) << " offset " << to_hex(offset) << " len " << pretty(size));
BEESTOOLONG("unreadahead " << name_fd(fd) << " offset " << to_hex(offset) << " len " << pretty(size));
DIE_IF_NON_ZERO(posix_fadvise(fd, offset, size, POSIX_FADV_DONTNEED));
BEESCOUNTADD(readahead_unread_ms, unreadahead_timer.age() * 1000);
}
BeesStringFile::BeesStringFile(Fd dir_fd, string name, size_t limit) :
m_dir_fd(dir_fd),
m_name(name),