Re: [Qemu-devel] [PATCH v5] iothread: fix epollfd leak in the process of delIOThread

[WangJie (Pluto)]

OK! I will split into two patches

On 2018/5/17 11:04, Peter Xu wrote:
> On Thu, May 17, 2018 at 08:42:43AM +0800, Jie Wang wrote:
>> When we call addIOThread, the epollfd created in aio_context_setup,
>> but not close it in the process of delIOThread, so the epollfd will leak.
> 
> (maybe also mention about the aio_epoll_disable change, or split into
>  two patches?)
> 
>>
>> Signed-off-by: Jie Wang <address@hidden>
> 
> Reviewed-by: Peter Xu <address@hidden>
> 
>> ---
>>  include/block/aio.h |  8 ++++++++
>>  util/aio-posix.c    | 13 ++++++++++---
>>  util/aio-win32.c    |  4 ++++
>>  util/async.c        |  1 +
>>  4 files changed, 23 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/block/aio.h b/include/block/aio.h
>> index a1d6b9e..ae6f354 100644
>> --- a/include/block/aio.h
>> +++ b/include/block/aio.h
>> @@ -555,6 +555,14 @@ static inline bool 
>> in_aio_context_home_thread(AioContext *ctx)
>>  void aio_context_setup(AioContext *ctx);
>>  
>>  /**
>> + * aio_context_destroy:
>> + * @ctx: the aio context
>> + *
>> + * Destroy the aio context.
>> + */
>> +void aio_context_destroy(AioContext *ctx);
>> +
>> +/**
>>   * aio_context_set_poll_params:
>>   * @ctx: the aio context
>>   * @max_ns: how long to busy poll for, in nanoseconds
>> diff --git a/util/aio-posix.c b/util/aio-posix.c
>> index d8f0cb4..118bf57 100644
>> --- a/util/aio-posix.c
>> +++ b/util/aio-posix.c
>> @@ -45,11 +45,11 @@ struct AioHandler
>>  
>>  static void aio_epoll_disable(AioContext *ctx)
>>  {
>> -    ctx->epoll_available = false;
>> -    if (!ctx->epoll_enabled) {
>> +    ctx->epoll_enabled = false;
>> +    if (!ctx->epoll_available) {
>>          return;
>>      }
>> -    ctx->epoll_enabled = false;
>> +    ctx->epoll_available = false;
>>      close(ctx->epollfd);
>>  }
>>  
>> @@ -713,6 +713,13 @@ void aio_context_setup(AioContext *ctx)
>>  #endif
>>  }
>>  
>> +void aio_context_destroy(AioContext *ctx)
>> +{
>> +#ifdef CONFIG_EPOLL_CREATE1
>> +    aio_epoll_disable(ctx);
>> +#endif
>> +}
>> +
>>  void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns,
>>                                   int64_t grow, int64_t shrink, Error **errp)
>>  {
>> diff --git a/util/aio-win32.c b/util/aio-win32.c
>> index a67b00c..e676a8d 100644
>> --- a/util/aio-win32.c
>> +++ b/util/aio-win32.c
>> @@ -407,6 +407,10 @@ void aio_context_setup(AioContext *ctx)
>>  {
>>  }
>>  
>> +void aio_context_destroy(AioContext *ctx)
>> +{
>> +}
>> +
>>  void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns,
>>                                   int64_t grow, int64_t shrink, Error **errp)
>>  {
>> diff --git a/util/async.c b/util/async.c
>> index 4dd9d95..03f6278 100644
>> --- a/util/async.c
>> +++ b/util/async.c
>> @@ -298,6 +298,7 @@ aio_ctx_finalize(GSource     *source)
>>      qemu_rec_mutex_destroy(&ctx->lock);
>>      qemu_lockcnt_destroy(&ctx->list_lock);
>>      timerlistgroup_deinit(&ctx->tlg);
>> +    aio_context_destroy(ctx);
>>  }
>>  
>>  static GSourceFuncs aio_source_funcs = {
>> -- 
>> 1.8.3.1
>>
>