Summary:
- I noticed waitpid_test stops with lc823450-xgevk:rndis
- The condition was CONFIG_DEBUG_ASSERTION=y
- Actually, the child task sent SIGCHILD but the parent couldn't catch the signal
- Then, I found that nx_waitid(), nx_waitpid() use sched_lock()
- However, a parent task and a child task are running on different CPUs
- So, sched_lock() is not enough and need to use a critical section
- Also, signal handling in nxtask_exithook() must be done in a critical section
Impact:
- SMP only
Testing:
- Tested with ostest with the following configurations
- lc823450-xgevk:rndis (CONFIG_DEBUG_ASSERTION=y and n)
- spresense:smp
- spresense:wifi_smp (NCPUS=2 and 4)
- sabre-6quad:smp (QEMU)
- esp32-core:smp (QEMU)
- maix-bit:smp (QEMU)
- sim:smp
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Summary:
- sched_tasklistlock.c was introduced to stabilize NuttX SMP
- However, the current SMP implementation is stable by recent fixes
- So I decided to remove the file finally
Impact:
- SMP only
Testing:
- Tested with ostest with the following configurations
- spresense:smp
- spresense:wifi_smp (NCPUS=2 and 4)
- sabre-6quad:smp (QEMU)
- esp32-core:smp (QEMU)
- maix-bit:smp (QEMU)
- sim:smp
- lc823450-xgevk:rndis
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Summary:
- I noticed 'pthread_rwlock test' in ostest sometimes stops
- This issue happened with spresense:wifi_smp (NCPUS=4) and sim:smp
- Finally, I found an issue in pthread_join()
- In pthread_join(), sched_lock() is used to avoid pre-emption
- However, this is not enough for SMP
- Because another CPU would continue the pthread and exit sequences
- So we need to protect it with a critical section
Impact:
- Affect SMP only
Testing:
- Tested with ostest with the following configurations
- spresnese:smp
- spresense:wifi_smp (NCPUS=2, NCPUS=4)
- sabre-6quad:smp (QEMU)
- esp32-core:smp (QEMU)
- maix-bit:smp (QEMU)
- sim:smp
- lc823450-xgevk:rndis
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Reference here:
https://pubs.opengroup.org/onlinepubs/009695399/functions/timer_create.html
DESCRIPTION
...
Each implementation shall define a set of clocks that can be
used as timing bases for per-process timers. All implementations
shall support a clock_id of CLOCK_REALTIME.
*** If the Monotonic Clock option is supported, implementations shall
support a clock_id of CLOCK_MONOTONIC. ***
...
Change-Id: Ia8e7302ed4a7e9ec11a0059bd68e9674ea942001
Signed-off-by: chao.an <anchao@xiaomi.com>
Summary:
- I noticed that nxsched_merge_pending() is called outside a critical section
- The issue happens if a new rtcb does not hold a critical section
- Actually, global IRQ control is done in nxsched_resume_scheduler() in nxtask_exit()
- However, nxsched_merge_pending() was called after calling nxsched_resume_scheduler()
- This commit fixes the issue by moving nxsched_merge_pending() before the function
- NOTE: the sequence was changed for SMP but works for non-SMP as well
Impact:
- This commit affects both SMP and non-SMP
Testing:
- Tested with ostest with the following configurations
- spresense:wifi_smp (NCPUS=2 and 4)
- spresense:wifi (non SMP)
- sabre-6quad:smp (QEMU)
- esp32-core:smp (QEMU)
- maix-bit:smp (QEMU)
- sim:smp
- lc823450-xgevk:rndis
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
In file included from string/lib_strsignal.c:40:0:
string/lib_strsignal.c: In function ‘strsignal’:
string/lib_strsignal.c:142:12: error: ‘CONFIG_SIG_STOP’ undeclared (first use in this function); did you mean ‘CONFIG_SIG_PIPE’?
case SIGSTOP:
^
string/lib_strsignal.c:142:12: note: each undeclared identifier is reported only once for each function it appears in
string/lib_strsignal.c:147:12: error: ‘CONFIG_SIG_STP’ undeclared (first use in this function); did you mean ‘CONFIG_SIG_STOP’?
case SIGSTP:
Esnure all standard signal number is always defined
Change-Id: I3abce86079ebeba7bab038d7c770efc90b9cffd7
Signed-off-by: ligd <liguiding1@xiaomi.com>
Summary:
- I found a deadlock during Wi-Fi audio streaming test plus stress test
- The testing environment was spresense:wifi_smp (NCPUS=4)
- The deadlock happened because two CPUs called up_cpu_pause() almost simultaneously
- This situation should not happen, because up_cpu_pause() is called in a critical section
- Actually, the latter call was from nxsem_post() in an IRQ handler
- And when enter_critical_section() was called, irq_waitlock() detected a deadlock
- Then it called up_cpu_paused() to break the deadlock
- However, this resulted in setting g_cpu_irqset on the CPU
- Even though another CPU had held a g_cpu_irqlock
- This situation violates the critical section and should be avoided
- To avoid the situation, if a CPU sets g_cpu_irqset after calling up_cpu_paused()
- The CPU must release g_cpu_irqlock first
- Then retry irq_waitlock() to acquire g_cpu_irqlock
Impact:
- Affect SMP
Testing:
- Tested with spresense:wifi_smp (NCPUS=2 and 4)
- Tested with spresense:smp
- Tested with sim:smp
- Tested with sabre-6quad:smp (QEMU)
- Tested with maix-bit:smp (QEMU)
- Tested with esp32-core:smp (QEMU)
- Tested with lc823450-xgevk:rndis
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Follow the POSIX description.
SIGTSTP should be sent when the Ctrl-Z characters is encountered, not SIGSTP.
Testing:
Built with hifive1-revb:nsh (CONFIG_SERIAL_TERMIOS=y, CONFIG_SIG_DEFAULT=y and CONFIG_TTY_SIGTSTP=y)
Summary:
- I noticed sched_lock() logic is different from sched_unlock()
- I think sched_lock() should use critical section
- Also, the code should be simple like sched_unlock()
- This commit fixes these issues
Impact:
- Affects SMP only
Testing:
- Tested with spresense:wifi_smp (both NCPUS=2 and 3)
- Tested with lc823450-xgevk:rndis
- Tested with maix-bit:smp (QEMU)
- Tested with esp32-core:smp (QEMU)
- Tested with sabre-6quad:smp (QEMU)
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Summary:
- I noticed DEBUGASSERT() happens in sched_unlock()
- The test was Wi-Fi audio streaming stress test with spresense 3cores
- Actually, g_cpu_schedlock was locked but g_cpu_lockset was incorrect
- Finally, I found that cpu was obtained before enter_critical_section()
- And the task was moved from one cpu to another cpu
- However, that call should be done within the critical section
- This commit fixes this issue
Impact:
- Affects SMP only
Testing:
- Tested with spresense:wifi_smp (both NCPUS=2 and 3)
- Tested with lc823450-xgevk:rndis
- Tested with maix-bit:smp (QEMU)
- Tested with esp32-core:smp (QEMU)
- Tested with sabre-6quad:smp (QEMU)
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
to ensure the basic info(e.g. pid) setup correctly before call arch API
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I851cb0fdf22f45844938dafc5981b3f576100dba
Summary:
- During Wi-Fi audio streaming test, I found a deadlock in nxtask_exit()
- Actually, nxtask_exit() was called and tried to enter critical section
- In enter_critical_section(), there is a deadlock avoidance logic
- However, if switched to a new rtcb with irqcount=0, the logic did not work
- Because the 2nd critical section was treated as if it were the 1st one
- Actually, it tried to run the deadlock avoidance logic
- But nxtask_exit() was called with critical section (i.e. IRQ already disabled)
- So the logic did not work as expected because up_irq_restore() did not enable the IRQ.
- This commit fixes this issue by incrementing irqcount before calling nxtask_terminate()
- Also it adjusts g_cpu_irqlock and g_cpu_lockset
Impact:
- Affects SMP only
Testing:
- Tested with spresense:wifi_smp (smp, ostest, nxplayer, telnetd)
- Tested with sabre-6quad:smp with QEMU (smp, ostest)
- Tested with maix-bit:smp with QEMU (smp, ostest)
- Tested with esp32-core:smp with QEMU (smp, ostest)
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
since nxtask_startup will initialize c++ global variables which shouldn't
be done inside the kernel thread
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Move sched/task/task/task_gettid.c to libs/libc/unistd/lib_gettid.c. gettid() is a dumb wrapper around getpid(). It is wasteful of resources to support TWO systme calls, one for getpid() and one for gettid(). Instead, move gettid() in the C library where it calls the single sysgtem call, getpid(). Much cleaner.
1.Reduce the default size of task_group_s(~512B each task)
2.Scale better between simple and complex application
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: Ia872137504fddcf64d89c48d6f0593d76d582710
Summary:
- ARCH_GLOBAL_IRQDISABLE was initially introduced for LC823450 SMP
- At that time, i.MX6 (quad Cortex-A9) did not use this config
- However, this option is now used for all CPUs which support SMP
- So it's good timing for refactoring the code
Impact:
- Should have no impact because the logic is the same for SMP
Testing:
- Tested with board: spresense:smp, spresense:wifi_smp
- Tested with qemu: esp32-core:smp, maix-bit:smp, sabre-6quad:smp
- Build only: lc823450-xgevk:rndis, sam4cmp-db:nsh
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Masayuki Ishikawa