l*i
2 楼
w*s
3 楼
almost each place of find_vpid, there's a rcu_lock, why's that ?
n*t
4 楼
你说的是rcu_read_lock吧。
【在 w*s 的大作中提到】
: almost each place of find_vpid, there's a rcu_lock, why's that ?
【在 w*s 的大作中提到】
: almost each place of find_vpid, there's a rcu_lock, why's that ?
w*s
5 楼
yes, you are right.
拿个小板凳听大师讲讲。。。
【在 n******t 的大作中提到】
: 你说的是rcu_read_lock吧。
拿个小板凳听大师讲讲。。。
【在 n******t 的大作中提到】
: 你说的是rcu_read_lock吧。
n*t
6 楼
pid是放在全局的pid_hash 这个数据结构里面的，这个东西用rcu机制来做同步，find_
vpid,作为rcu的reader,肯定需要用rcu_read_lock 和rcu_read_unlock了，从调用方式
上来说和 mark临界区没什么区别了。
【在 w*s 的大作中提到】
: yes, you are right.
: 拿个小板凳听大师讲讲。。。
vpid,作为rcu的reader,肯定需要用rcu_read_lock 和rcu_read_unlock了，从调用方式
上来说和 mark临界区没什么区别了。
【在 w*s 的大作中提到】
: yes, you are right.
: 拿个小板凳听大师讲讲。。。
w*s
7 楼
i used rcu_read_lock() to protect find_vpid in ISR,
crashes inside find_vpid.
then i use spin_lock_irq_save() around it, still same crashes.
now i'm crashing.
Any hints why this is happening ?
find_
【在 n******t 的大作中提到】
: pid是放在全局的pid_hash 这个数据结构里面的，这个东西用rcu机制来做同步，find_
: vpid,作为rcu的reader,肯定需要用rcu_read_lock 和rcu_read_unlock了，从调用方式
: 上来说和 mark临界区没什么区别了。
crashes inside find_vpid.
then i use spin_lock_irq_save() around it, still same crashes.
now i'm crashing.
Any hints why this is happening ?
find_
【在 n******t 的大作中提到】
: pid是放在全局的pid_hash 这个数据结构里面的，这个东西用rcu机制来做同步，find_
: vpid,作为rcu的reader,肯定需要用rcu_read_lock 和rcu_read_unlock了，从调用方式
: 上来说和 mark临界区没什么区别了。
n*t
8 楼
does not look like that should cause crashing, did you do any modification t
o the pid table in the ISR?
However, I am wondering why you want to traverse a hlist in the ISR,
usually that should be delayed and ISRs are only used to do very simple task
s.
【在 w*s 的大作中提到】
: i used rcu_read_lock() to protect find_vpid in ISR,
: crashes inside find_vpid.
: then i use spin_lock_irq_save() around it, still same crashes.
: now i'm crashing.
: Any hints why this is happening ?
:
: find_
o the pid table in the ISR?
However, I am wondering why you want to traverse a hlist in the ISR,
usually that should be delayed and ISRs are only used to do very simple task
s.
【在 w*s 的大作中提到】
: i used rcu_read_lock() to protect find_vpid in ISR,
: crashes inside find_vpid.
: then i use spin_lock_irq_save() around it, still same crashes.
: now i'm crashing.
: Any hints why this is happening ?
:
: find_
w*s
9 楼
no i don't change pid table.
yes if i get ride of that find_vpid in ISR, it works fine now.
so might be the delay causing issues, when there're too many interrupts.
t
task
【在 n******t 的大作中提到】
: does not look like that should cause crashing, did you do any modification t
: o the pid table in the ISR?
: However, I am wondering why you want to traverse a hlist in the ISR,
: usually that should be delayed and ISRs are only used to do very simple task
: s.
yes if i get ride of that find_vpid in ISR, it works fine now.
so might be the delay causing issues, when there're too many interrupts.
t
task
【在 n******t 的大作中提到】
: does not look like that should cause crashing, did you do any modification t
: o the pid table in the ISR?
: However, I am wondering why you want to traverse a hlist in the ISR,
: usually that should be delayed and ISRs are only used to do very simple task
: s.
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