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bees: use helper function for readahead

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There seem to be multiple ways to do readahead in Linux, and only some
of them work.  Hopefully reading the actual data is one of them.

This is an attempt to avoid page-by-page reads in the generic dedupe code.
We load both extents into the VFS cache (read sequentially) and hope they
are still there by the time we call dedupe on them.

We also call readahead(2) and hopefully that either helps or does nothing.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2021-05-28 01:58:16 -04:00
parent 0afd2850f4
commit 20b8f8ae0b
4 changed files with 34 additions and 5 deletions
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src/bees.h
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@ -119,6 +119,9 @@ const bool BEES_SERIALIZE_RESOLVE = false;
// Workaround for tree mod log bugs
const bool BEES_SERIALIZE_BALANCE = false;
// Workaround for silly dedupe / ineffective readahead behavior
const size_t BEES_READAHEAD_SIZE = 1024 * 1024;
// Flags
const int FLAGS_OPEN_COMMON = O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC | O_NOATIME | O_LARGEFILE | O_NOCTTY;
const int FLAGS_OPEN_DIR = FLAGS_OPEN_COMMON | O_RDONLY | O_DIRECTORY;
@ -880,6 +883,7 @@ extern const char *BEES_USAGE;
extern const char *BEES_VERSION;
string pretty(double d);
void bees_sync(int fd);
void bees_readahead(int fd, off_t offset, size_t size);
string format_time(time_t t);
#endif