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Blame SOURCES/0390-journal-normalize-priority-of-logging-sources.patch

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From c87355bc80da9e2cba7f7723d7c6568dfa56f1a1 Mon Sep 17 00:00:00 2001
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From: Vito Caputo <vito.caputo@coreos.com>
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Date: Fri, 8 Jan 2016 12:11:44 -0800
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Subject: [PATCH] journal: normalize priority of logging sources
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The stream event source has a priority of SD_EVENT_PRIORITY_NORMAL+5,
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and stdout source +10, but the native and syslog event sources are left
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at the default of 0.
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As a result, any heavy native or syslog logger can cause starvation of
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the other loggers.  This is trivially demonstrated by running:
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 dd if=/dev/urandom bs=8k | od | systemd-cat & # native spammer
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 systemd-run echo hello & # stream logger
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 journalctl --follow --output=verbose --no-pager --identifier=echo &
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... and wait, and wait, the "hello" never comes.
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Now kill %1, "hello" arrives finally.
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Cherry-picked from: 48cef29504b1ffc0df9929f2d8b2af2ad74d2b4a
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Related: #1318994
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---
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 src/journal/journald-native.c | 4 ++++
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 src/journal/journald-stream.c | 2 +-
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 src/journal/journald-syslog.c | 4 ++++
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 3 files changed, 9 insertions(+), 1 deletion(-)
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diff --git a/src/journal/journald-native.c b/src/journal/journald-native.c
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index 851625de0..2c9cf6e7a 100644
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--- a/src/journal/journald-native.c
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+++ b/src/journal/journald-native.c
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@@ -457,5 +457,9 @@ int server_open_native_socket(Server*s) {
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         if (r < 0)
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                 return log_error_errno(r, "Failed to add native server fd to event loop: %m");
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+        r = sd_event_source_set_priority(s->native_event_source, SD_EVENT_PRIORITY_NORMAL+5);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to adjust native event source priority: %m");
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+
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         return 0;
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 }
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diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c
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index 15a554c34..b8607144b 100644
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--- a/src/journal/journald-stream.c
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+++ b/src/journal/journald-stream.c
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@@ -448,7 +448,7 @@ int server_open_stdout_socket(Server *s) {
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         if (r < 0)
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                 return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
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-        r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+10);
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+        r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+5);
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         if (r < 0)
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                 return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
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diff --git a/src/journal/journald-syslog.c b/src/journal/journald-syslog.c
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index 4e118aabc..8602b4a95 100644
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--- a/src/journal/journald-syslog.c
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+++ b/src/journal/journald-syslog.c
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@@ -421,6 +421,10 @@ int server_open_syslog_socket(Server *s) {
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         if (r < 0)
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                 return log_error_errno(r, "Failed to add syslog server fd to event loop: %m");
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+        r = sd_event_source_set_priority(s->syslog_event_source, SD_EVENT_PRIORITY_NORMAL+5);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to adjust syslog event source priority: %m");
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+
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         return 0;
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 }
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