[v1] Logging cleanup and per-thread logfiles

[PULL for-7.1 15/36] util/log: Use qemu_log_lock/unlock in qemu_log

Richard Henderson posted 36 patches 3 years, 10 months ago

Diff against v1 v2 v3
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Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Warner Losh <imp@bsdimp.com>, Kyle Evans <kevans@freebsd.org>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, Yanan Wang <wangyanan55@huawei.com>, Pavel Pisa <pisa@cmp.felk.cvut.cz>, Vikram Garhwal <fnu.vikram@xilinx.com>, Jason Wang <jasowang@redhat.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony Perard <anthony.perard@citrix.com>, Paul Durrant <paul@xen.org>, Stefan Weil <sw@weilnetz.de>, Laurent Vivier <laurent@vivier.eu>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Markus Armbruster <armbru@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Eric Blake <eblake@redhat.com>, Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>, Fam Zheng <fam@euphon.net>, Peter Maydell <peter.maydell@linaro.org>, Michael Rolnik <mrolnik@gmail.com>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Taylor Simpson <tsimpson@quicinc.com>, Aurelien Jarno <aurelien@aurel32.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Chris Wulff <crwulff@gmail.com>, Marek Vasut <marex@denx.de>, Stafford Horne <shorne@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, Daniel Henrique Barboza <danielhb413@gmail.com>, David Gibson <david@gibson.dropbear.id.au>, Greg Kurz <groug@kaod.org>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, David Hildenbrand <david@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Thomas Huth <thuth@redhat.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Artyom Tarasenko <atar4qemu@gmail.com>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Max Filippov <jcmvbkbc@gmail.com>

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[PULL for-7.1 15/36] util/log: Use qemu_log_lock/unlock in qemu_log

Posted by Richard Henderson 3 years, 10 months ago

Avoid using QemuLogFile and RCU directly.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 util/log.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/util/log.c b/util/log.c
index b1651d8122..3ec6e90575 100644
--- a/util/log.c
+++ b/util/log.c
@@ -62,23 +62,22 @@ void qemu_log_unlock(FILE *fd)
 /* Return the number of characters emitted.  */
 int qemu_log(const char *fmt, ...)
 {
+    FILE *f = qemu_log_lock();
     int ret = 0;
-    QemuLogFile *logfile;
 
-    rcu_read_lock();
-    logfile = qatomic_rcu_read(&qemu_logfile);
-    if (logfile) {
+    if (f) {
         va_list ap;
+
         va_start(ap, fmt);
-        ret = vfprintf(logfile->fd, fmt, ap);
+        ret = vfprintf(f, fmt, ap);
         va_end(ap);
+        qemu_log_unlock(f);
 
         /* Don't pass back error results.  */
         if (ret < 0) {
             ret = 0;
         }
     }
-    rcu_read_unlock();
     return ret;
 }
 
-- 
2.25.1

Re: [PULL for-7.1 15/36] util/log: Use qemu_log_lock/unlock in qemu_log

Posted by Alex Bennée 3 years, 10 months ago

Richard Henderson <richard.henderson@linaro.org> writes:

> Avoid using QemuLogFile and RCU directly.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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

-- 
Alex Bennée