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[Qemu-devel] [PATCH v9 11/56] ram_debug_dump_bitmap: Dump a migration bi
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [PATCH v9 11/56] ram_debug_dump_bitmap: Dump a migration bitmap as text |
Date: |
Thu, 5 Nov 2015 18:10:38 +0000 |
From: "Dr. David Alan Gilbert" <address@hidden>
Useful for debugging the migration bitmap and other bitmaps
of the same format (including the sentmap in postcopy).
The bitmap is printed to stderr.
Lines that are all the expected value are excluded so the output
can be quite compact for many bitmaps.
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Reviewed-by: Amit Shah <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
---
include/migration/migration.h | 1 +
migration/ram.c | 39 +++++++++++++++++++++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/include/migration/migration.h b/include/migration/migration.h
index 83fba23..51bc348 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -145,6 +145,7 @@ uint64_t xbzrle_mig_pages_cache_miss(void);
double xbzrle_mig_cache_miss_rate(void);
void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
+void ram_debug_dump_bitmap(unsigned long *todump, bool expected);
/**
* @migrate_add_blocker - prevent migration from proceeding
diff --git a/migration/ram.c b/migration/ram.c
index d654a73..86bf657 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1160,6 +1160,45 @@ void migration_bitmap_extend(ram_addr_t old, ram_addr_t
new)
}
}
+/*
+ * 'expected' is the value you expect the bitmap mostly to be full
+ * of; it won't bother printing lines that are all this value.
+ * If 'todump' is null the migration bitmap is dumped.
+ */
+void ram_debug_dump_bitmap(unsigned long *todump, bool expected)
+{
+ int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS;
+
+ int64_t cur;
+ int64_t linelen = 128;
+ char linebuf[129];
+
+ if (!todump) {
+ todump = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ }
+
+ for (cur = 0; cur < ram_pages; cur += linelen) {
+ int64_t curb;
+ bool found = false;
+ /*
+ * Last line; catch the case where the line length
+ * is longer than remaining ram
+ */
+ if (cur + linelen > ram_pages) {
+ linelen = ram_pages - cur;
+ }
+ for (curb = 0; curb < linelen; curb++) {
+ bool thisbit = test_bit(cur + curb, todump);
+ linebuf[curb] = thisbit ? '1' : '.';
+ found = found || (thisbit != expected);
+ }
+ if (found) {
+ linebuf[curb] = '\0';
+ fprintf(stderr, "0x%08" PRIx64 " : %s\n", cur, linebuf);
+ }
+ }
+}
+
/* Each of ram_save_setup, ram_save_iterate and ram_save_complete has
* long-running RCU critical section. When rcu-reclaims in the code
* start to become numerous it will be necessary to reduce the
--
2.5.0
- [Qemu-devel] [PATCH v9 04/56] Move page_size_init earlier, (continued)
- [Qemu-devel] [PATCH v9 04/56] Move page_size_init earlier, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 05/56] qemu_ram_block_from_host, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 06/56] qemu_ram_block_by_name, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 08/56] Add qemu_get_buffer_in_place to avoid copies some of the time, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 07/56] Rename mis->file to from_src_file, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 09/56] Add wrapper for setting blocking status on a QEMUFile, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 10/56] Add QEMU_MADV_NOHUGEPAGE, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 11/56] ram_debug_dump_bitmap: Dump a migration bitmap as text,
Dr. David Alan Gilbert (git) <=
- [Qemu-devel] [PATCH v9 12/56] ram_load: Factor out host_from_stream_offset call and check, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 13/56] migrate_init: Call from savevm, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 16/56] Return path: Open a return path on QEMUFile for sockets, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 15/56] Add Linux userfaultfd.h header, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 14/56] Rename save_live_complete to save_live_complete_precopy, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 17/56] Return path: socket_writev_buffer: Block even on non-blocking fd's, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 18/56] Migration commands, Dr. David Alan Gilbert (git), 2015/11/05
- [Qemu-devel] [PATCH v9 19/56] Return path: Control commands, Dr. David Alan Gilbert (git), 2015/11/05