[PATCH] keep dumpfile pages in a cache.

Add a simple cache for pages read from the dumpfile.

This is a big win if we read consecutive data from one page, e.g.
page descriptors, or even page table entries.

Note that makedumpfile now always reads a complete page. This was already
the case with kdump-compressed and sadump formats, but makedumpfile was
throwing most of the data away. For the kdump-compressed case, we may
actually save a lot of decompression, too.

I tried to keep the cache small to minimize memory footprint, but it should
be big enough to hold all pages to do 4-level paging plus some data. This
is needed e.g. for vmalloc areas or Xen page frame table data, which are not
contiguous in physical memory.

Signed-off-by: Petr Tesarik <ptesarik@suse.cz>

1 files changed, 1 insertions, 1 deletions

diff --git a/sadump_info.h b/sadump_info.h
index c4824be..766f35d 100644
--- a/sadump_info.h
+++ b/sadump_info.h
@@ -43,7 +43,7 @@ int sadump_initialize_bitmap_memory(void);
 int sadump_num_online_cpus(void);
 int sadump_set_timestamp(struct timeval *ts);
 unsigned long long sadump_get_max_mapnr(void);
-int readpmem_sadump(unsigned long long paddr, void *bufptr, size_t size);
+int readpage_sadump(unsigned long long paddr, void *bufptr);
 int sadump_check_debug_info(void);
 int sadump_generate_vmcoreinfo_from_vmlinux(size_t *vmcoreinfo_size);
 int sadump_generate_elf_note_from_dumpfile(void);