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xen
23407-xentrace_allocate_non-contiguous_per-cpu_...
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File 23407-xentrace_allocate_non-contiguous_per-cpu_trace_buffers.patch of Package xen
changeset: 23407:b19898ac3e32 user: Olaf Hering <olaf@aepfle.de> date: Thu May 26 12:36:27 2011 +0100 files: xen/common/trace.c description: xentrace: allocate non-contiguous per-cpu trace buffers Signed-off-by: Olaf Hering <olaf@aepfle.de> Acked-by: George Dunlap <george.dunlap@eu.citrix.com> --- xen/common/trace.c | 92 ++++++++++++++++++++++++++++------------------------- 1 file changed, 50 insertions(+), 42 deletions(-) Index: xen-4.1.2-testing/xen/common/trace.c =================================================================== --- xen-4.1.2-testing.orig/xen/common/trace.c +++ xen-4.1.2-testing/xen/common/trace.c @@ -166,7 +166,7 @@ static int calculate_tbuf_size(unsigned */ static int alloc_trace_bufs(unsigned int pages) { - int i, cpu, order; + int i, cpu; /* Start after a fixed-size array of NR_CPUS */ uint32_t *t_info_mfn_list; uint16_t t_info_first_offset; @@ -182,34 +182,11 @@ static int alloc_trace_bufs(unsigned int t_info_first_offset = calc_tinfo_first_offset(); pages = calculate_tbuf_size(pages, t_info_first_offset); - order = get_order_from_pages(pages); t_info = alloc_xenheap_pages(get_order_from_pages(t_info_pages), 0); if ( t_info == NULL ) - goto out_dealloc; + goto out_dealloc_t_info; - /* - * First, allocate buffers for all of the cpus. If any - * fails, deallocate what you have so far and exit. - */ - for_each_online_cpu(cpu) - { - void *rawbuf; - struct t_buf *buf; - - if ( (rawbuf = alloc_xenheap_pages( - order, MEMF_bits(32 + PAGE_SHIFT))) == NULL ) - { - printk(XENLOG_INFO "xentrace: memory allocation failed " - "on cpu %d\n", cpu); - goto out_dealloc; - } - - per_cpu(t_bufs, cpu) = buf = rawbuf; - buf->cons = buf->prod = 0; - } - - offset = t_info_first_offset; t_info_mfn_list = (uint32_t *)t_info; for(i = 0; i < t_info_pages; i++) @@ -219,27 +196,53 @@ static int alloc_trace_bufs(unsigned int t_info->tbuf_size = pages; /* - * Now share the pages so xentrace can map them, and write them in - * the global t_info structure. + * Allocate buffers for all of the cpus. + * If any fails, deallocate what you have so far and exit. */ for_each_online_cpu(cpu) { - void *rawbuf = per_cpu(t_bufs, cpu); - struct page_info *p = virt_to_page(rawbuf); - uint32_t mfn = virt_to_mfn(rawbuf); + offset = t_info_first_offset + (cpu * pages); + t_info->mfn_offset[cpu] = offset; for ( i = 0; i < pages; i++ ) { - share_xen_page_with_privileged_guests(p + i, XENSHARE_writable); - - t_info_mfn_list[offset + i]=mfn + i; + void *p = alloc_xenheap_pages(0, MEMF_bits(32 + PAGE_SHIFT)); + if ( !p ) + { + printk(XENLOG_INFO "xentrace: memory allocation failed " + "on cpu %d after %d pages\n", cpu, i); + t_info_mfn_list[offset + i] = 0; + goto out_dealloc; + } + t_info_mfn_list[offset + i] = virt_to_mfn(p); } - t_info->mfn_offset[cpu]=offset; - printk(XENLOG_INFO "xentrace: p%d mfn %"PRIx32" offset %d\n", - cpu, mfn, offset); - offset+=i; + } + + /* + * Initialize buffers for all of the cpus. + */ + for_each_online_cpu(cpu) + { + struct t_buf *buf; + struct page_info *pg; spin_lock_init(&per_cpu(t_lock, cpu)); + + offset = t_info->mfn_offset[cpu]; + + /* Initialize the buffer metadata */ + per_cpu(t_bufs, cpu) = buf = mfn_to_virt(t_info_mfn_list[offset]); + buf->cons = buf->prod = 0; + + printk(XENLOG_INFO "xentrace: p%d mfn %x offset %u\n", + cpu, t_info_mfn_list[offset], offset); + + /* Now share the trace pages */ + for ( i = 0; i < pages; i++ ) + { + pg = mfn_to_page(t_info_mfn_list[offset + i]); + share_xen_page_with_privileged_guests(pg, XENSHARE_writable); + } } data_size = (pages * PAGE_SIZE - sizeof(struct t_buf)); @@ -255,14 +258,19 @@ static int alloc_trace_bufs(unsigned int out_dealloc: for_each_online_cpu(cpu) { - void *rawbuf = per_cpu(t_bufs, cpu); - per_cpu(t_bufs, cpu) = NULL; - if ( rawbuf ) + offset = t_info->mfn_offset[cpu]; + if ( !offset ) + continue; + for ( i = 0; i < pages; i++ ) { - ASSERT(!(virt_to_page(rawbuf)->count_info & PGC_allocated)); - free_xenheap_pages(rawbuf, order); + uint32_t mfn = t_info_mfn_list[offset + i]; + if ( !mfn ) + break; + ASSERT(!(mfn_to_page(mfn)->count_info & PGC_allocated)); + free_xenheap_pages(mfn_to_virt(mfn), 0); } } +out_dealloc_t_info: free_xenheap_pages(t_info, get_order_from_pages(t_info_pages)); t_info = NULL; printk(XENLOG_WARNING "xentrace: allocation failed! Tracing disabled.\n");
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