Hi, mono_gc_free_fixed () is a no-op when using mono's built in GC, since mono_gc_alloc_fixed () is implemented as a call to GC_malloc ().
Zoltan On Wed, Aug 26, 2009 at 2:55 AM, James Zhao <jameszha...@gmail.com> wrote: > Hi, > Here's Mono Continuations' continuation_store (...). From looking at the > code below, it appears as though store() follows these two branches: > > 1. cont->saved_stack && num_bytes <= cont->stack_alloc_size - use the > memory directly > > 2. else - gc free the used memory, and create some new memory. > However, the weird thing is if I repeatedly use continuation_store(), the > memory usage increases until at a later step a huge and laggy GC operation > is done. Can anyone explain why this happens? > If I alloc/free a continuation for roughly each time I call store , the > continuation appears to be GC'ed immediately. > > Thanks > James > static int continuation_store (MonoContinuation *cont, int state, > MonoException **e) { MonoLMF *lmf = mono_get_lmf (); gsize num_bytes; if > (!cont->domain) *e = mono_get_exception_argument ("cont", "Continuation not > initialized"); if (cont->domain != mono_domain_get () || cont->thread_id != > GetCurrentThreadId ()) *e = mono_get_exception_argument ("cont", > "Continuation from another thread or domain"); cont->lmf = lmf; > cont->return_ip = __builtin_return_address (0); cont->return_sp = > __builtin_frame_address (0); num_bytes = (char*)cont->top_sp - > (char*)cont->return_sp; /*g_print ("store: %d bytes, sp: %p, ip: %p, lmf: > %p\n", num_bytes, cont->return_sp, cont->return_ip, lmf);*/ if > (cont->saved_stack && num_bytes <= cont->stack_alloc_size) { /* clear to > avoid GC retention */ if (num_bytes < cont->stack_used_size) memset > ((char*)cont->saved_stack + num_bytes, 0, cont->stack_used_size - > num_bytes); } else { tasklets_lock (); internal_init (); if > (cont->saved_stack) { mono_g_hash_table_remove (keepalive_stacks, > cont->saved_stack); mono_gc_free_fixed (cont->saved_stack); } > cont->stack_used_size = num_bytes; cont->stack_alloc_size = num_bytes * 1.1; > cont->saved_stack = mono_gc_alloc_fixed (cont->stack_alloc_size, NULL); > mono_g_hash_table_insert (keepalive_stacks, cont->saved_stack, > cont->saved_stack); tasklets_unlock (); } memcpy (cont->saved_stack, > cont->return_sp, num_bytes); return state; } > > _______________________________________________ > Mono-devel-list mailing list > Mono-devel-list@lists.ximian.com > http://lists.ximian.com/mailman/listinfo/mono-devel-list > >
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