1032a7c464
Hugepage filtering. OBS-URL: https://build.opensuse.org/request/show/237231 OBS-URL: https://build.opensuse.org/package/show/Kernel:kdump/makedumpfile?expand=0&rev=85
99 lines
2.9 KiB
Diff
99 lines
2.9 KiB
Diff
From: Petr Tesarik <ptesarik@suse.cz>
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Date: Tue May 27 08:58:36 2014 +0900
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Subject: Get rid of overrun adjustments.
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References: bnc#873232
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Patch-mainline: v1.5.7
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Git-commit: 22a614a0d891dbab0e7901f8dbf387a882c1d5cf
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Thanks to the previous commit, __exclude_unnecessary_pages does not
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require any specific size of the cycle.
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Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
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---
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makedumpfile.c | 59 ---------------------------------------------------------
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1 file changed, 59 deletions(-)
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--- a/makedumpfile.c
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+++ b/makedumpfile.c
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@@ -91,7 +91,6 @@ do { \
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*ptr_long_table = value; \
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} while (0)
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-static void check_cyclic_buffer_overrun(void);
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static void setup_page_is_buddy(void);
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void
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@@ -3254,9 +3253,6 @@ out:
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!sadump_generate_elf_note_from_dumpfile())
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return FALSE;
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- if (info->flag_cyclic && info->dump_level & DL_EXCLUDE_FREE)
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- check_cyclic_buffer_overrun();
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-
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} else {
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if (!get_mem_map_without_mm())
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return FALSE;
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@@ -4281,61 +4277,6 @@ exclude_free_page(struct cycle *cycle)
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}
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/*
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- * Let C be a cyclic buffer size and B a bitmap size used for
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- * representing maximum block size managed by buddy allocator.
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- *
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- * For some combinations of C and B, clearing operation can overrun
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- * the cyclic buffer. Let's consider three cases.
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- *
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- * - If C == B, this is trivially safe.
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- *
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- * - If B > C, overrun can easily happen.
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- *
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- * - In case of C > B, if C mod B != 0, then there exist n > m > 0,
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- * B > b > 0 such that n x C = m x B + b. This means that clearing
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- * operation overruns cyclic buffer (B - b)-bytes in the
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- * combination of n-th cycle and m-th block.
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- *
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- * Note that C mod B != 0 iff (m x C) mod B != 0 for some m.
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- *
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- * If C == B, C mod B == 0 always holds. Again, if B > C, C mod B != 0
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- * always holds. Hence, it's always sufficient to check the condition
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- * C mod B != 0 in order to determine whether overrun can happen or
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- * not.
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- *
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- * The bitmap size used for maximum block size B is calculated from
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- * MAX_ORDER as:
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- *
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- * B := DIVIDE_UP((1 << (MAX_ORDER - 1)), BITS_PER_BYTE)
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- *
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- * Normally, MAX_ORDER is 11 at default. This is configurable through
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- * CONFIG_FORCE_MAX_ZONEORDER.
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- */
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-static void
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-check_cyclic_buffer_overrun(void)
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-{
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- int max_order = ARRAY_LENGTH(zone.free_area);
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- int max_order_nr_pages = 1 << (max_order - 1);
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- unsigned long max_block_size = divideup(max_order_nr_pages, BITPERBYTE);
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-
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- if (info->bufsize_cyclic % max_block_size) {
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- unsigned long bufsize;
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-
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- if (max_block_size > info->bufsize_cyclic) {
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- MSG("WARNING: some free pages are not filtered.\n");
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- return;
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- }
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-
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- bufsize = info->bufsize_cyclic;
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- info->bufsize_cyclic = round(bufsize, max_block_size);
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- info->pfn_cyclic = info->bufsize_cyclic * BITPERBYTE;
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-
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- MSG("cyclic buffer size has been changed: %lu => %lu\n",
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- bufsize, info->bufsize_cyclic);
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- }
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-}
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-
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-/*
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* For the kernel versions from v2.6.17 to v2.6.37.
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*/
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static int
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