[GitHub] [incubator-nuttx] anchao commented on pull request #5645: arch/arm: optimize context switch speed

[GitBox <gi...@apache.org>]

anchao commented on pull request #5645:
URL: https://github.com/apache/incubator-nuttx/pull/5645#issuecomment-1055013498


   
   > I tried this PR with my latest imx6-netknsh branches (https://github.com/masayuki2009/incubator-nuttx/tree/imx6-netknsh https://github.com/masayuki2009/incubator-nuttx-apps/tree/imx6-netknsh) and found that init and hello work but getprime fails when it exits.
   
   
   @masayuki2009 san,
   
   I can reproduce this issue on your branch but without this PR, seems some wrong with syscall clock_gettime:
   
   
   ```
   apps$ git diff .
   diff --git a/testing/getprime/getprime_main.c b/testing/getprime/getprime_main.c
   index 7d6b730aa..d0cbd7e10 100644
   --- a/testing/getprime/getprime_main.c
   +++ b/testing/getprime/getprime_main.c
   @@ -181,9 +181,9 @@ int main(int argc, FAR char *argv[])
          ASSERT(0 < n && n <= MAX_THREADS);
        }
    
   -  (void)clock_gettime(CLOCK_REALTIME, &ts0);
   +  //(void)clock_gettime(CLOCK_REALTIME, &ts0);
      get_prime_in_parallel(n);
   -  (void)clock_gettime(CLOCK_REALTIME, &ts1);
   +  //(void)clock_gettime(CLOCK_REALTIME, &ts1);
    
      elapsed  = (((uint64_t)ts1.tv_sec * NSEC_PER_SEC) + ts1.tv_nsec);
      elapsed -= (((uint64_t)ts0.tv_sec * NSEC_PER_SEC) + ts0.tv_nsec);
   
   ```
   
   


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