diff mbox series

[PULL,for-7.1,01/36] util/log: Drop manual log buffering

Message ID 20220320171135.2704502-2-richard.henderson@linaro.org
State Superseded
Headers show
Series Logging cleanup and per-thread logfiles | expand

Commit Message

Richard Henderson March 20, 2022, 5:11 p.m. UTC 
This buffering was introduced during the Paleozoic: 9fa3e853531.

There has never been an explanation as to why we may not allow
glibc to allocate the file buffer itself.  We certainly have
many other uses of mmap and malloc during user-only startup,
so presumably whatever the issue was, it has been fixed during
the preceeding 18 years.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/qemu/log.h |  1 -
 bsd-user/main.c    |  1 -
 linux-user/main.c  |  1 -
 util/log.c         | 21 ++++-----------------
 4 files changed, 4 insertions(+), 20 deletions(-)

Comments

Alex Bennée March 23, 2022, 1:54 p.m. UTC | #1 
Richard Henderson <richard.henderson@linaro.org> writes:

> This buffering was introduced during the Paleozoic: 9fa3e853531.
>
> There has never been an explanation as to why we may not allow
> glibc to allocate the file buffer itself.  We certainly have
> many other uses of mmap and malloc during user-only startup,
> so presumably whatever the issue was, it has been fixed during
> the preceeding 18 years.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
diff mbox series

Patch

diff --git a/include/qemu/log.h b/include/qemu/log.h
index 9b80660207..08b0cd0bb3 100644
--- a/include/qemu/log.h
+++ b/include/qemu/log.h
@@ -148,7 +148,6 @@  typedef struct QEMULogItem {
 extern const QEMULogItem qemu_log_items[];
 
 void qemu_set_log(int log_flags);
-void qemu_log_needs_buffers(void);
 void qemu_set_log_filename(const char *filename, Error **errp);
 void qemu_set_dfilter_ranges(const char *ranges, Error **errp);
 bool qemu_log_in_addr_range(uint64_t addr);
diff --git a/bsd-user/main.c b/bsd-user/main.c
index 88d347d05e..08f43af235 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -405,7 +405,6 @@  int main(int argc, char **argv)
     }
 
     /* init debug */
-    qemu_log_needs_buffers();
     qemu_set_log_filename(log_file, &error_fatal);
     if (log_mask) {
         int mask;
diff --git a/linux-user/main.c b/linux-user/main.c
index fbc9bcfd5f..2b06350688 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -679,7 +679,6 @@  int main(int argc, char **argv, char **envp)
 
     log_mask = last_log_mask | (enable_strace ? LOG_STRACE : 0);
     if (log_mask) {
-        qemu_log_needs_buffers();
         qemu_set_log(log_mask);
     }
 
diff --git a/util/log.c b/util/log.c
index 2ee1500bee..ffa66a267e 100644
--- a/util/log.c
+++ b/util/log.c
@@ -72,8 +72,6 @@  static void qemu_logfile_free(QemuLogFile *logfile)
     g_free(logfile);
 }
 
-static bool log_uses_own_buffers;
-
 /* enable or disable low levels log */
 void qemu_set_log(int log_flags)
 {
@@ -121,29 +119,18 @@  void qemu_set_log(int log_flags)
             assert(!is_daemonized());
             logfile->fd = stderr;
         }
-        /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
-        if (log_uses_own_buffers) {
-            static char logfile_buf[4096];
 
-            setvbuf(logfile->fd, logfile_buf, _IOLBF, sizeof(logfile_buf));
-        } else {
 #if defined(_WIN32)
-            /* Win32 doesn't support line-buffering, so use unbuffered output. */
-            setvbuf(logfile->fd, NULL, _IONBF, 0);
+        /* Win32 doesn't support line-buffering, so use unbuffered output. */
+        setvbuf(logfile->fd, NULL, _IONBF, 0);
 #else
-            setvbuf(logfile->fd, NULL, _IOLBF, 0);
+        setvbuf(logfile->fd, NULL, _IOLBF, 0);
 #endif
-            log_append = 1;
-        }
+        log_append = 1;
         qatomic_rcu_set(&qemu_logfile, logfile);
     }
 }
 
-void qemu_log_needs_buffers(void)
-{
-    log_uses_own_buffers = true;
-}
-
 /*
  * Allow the user to include %d in their logfile which will be
  * substituted with the current PID. This is useful for debugging many