From 05aa9edde0f9f4077b8120389c93cb0134eda9c5 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Sat, 21 Jan 2012 02:51:13 +0100 Subject: readahead: don't monopolize IO when replaying --- src/readahead/readahead-replay.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'src/readahead/readahead-replay.c') diff --git a/src/readahead/readahead-replay.c b/src/readahead/readahead-replay.c index 00d57c3d7..0c739c82b 100644 --- a/src/readahead/readahead-replay.c +++ b/src/readahead/readahead-replay.c @@ -186,7 +186,13 @@ static int replay(const char *root) { if (on_ssd) prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0); else - prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 7); + /* We are not using RT here, since we'd starve IO that + we didn't record (which is for example blkid, since + its disk accesses go directly to the block device and + are thus not visible in fallocate) to death. However, + we do ask for an IO prio that is slightly higher than + the default (which is BE. 4) */ + prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 2); if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0) log_warning("Failed to set IDLE IO priority class: %m"); -- cgit v1.2.3