32 lines
1.2 KiB
Diff
32 lines
1.2 KiB
Diff
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Subject: xenpaging/qemu-dm: add command to flush buffer cache.
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Add support for a xenstore dm command to flush qemu's buffer cache.
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qemu will just keep mapping pages and not release them, which causes problems
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for the memory pager (since the page is mapped, it won't get paged out). When
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the pager has trouble finding a page to page out, it asks qemu to flush its
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buffer, which releases all the page mappings. This makes it possible to find
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pages to swap out agian.
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Already-Signed-off-by: Patrick Colp <Patrick.Colp@citrix.com>
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Signed-off-by: Olaf Hering <olaf@aepfle.de>
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---
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tools/ioemu-qemu-xen/xenstore.c | 3 +++
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1 file changed, 3 insertions(+)
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Index: xen-4.1.2-testing/tools/ioemu-qemu-xen/xenstore.c
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===================================================================
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--- xen-4.1.2-testing.orig/tools/ioemu-qemu-xen/xenstore.c
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+++ xen-4.1.2-testing/tools/ioemu-qemu-xen/xenstore.c
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@@ -1082,6 +1082,9 @@ static void xenstore_process_dm_command_
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do_pci_add(par);
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free(par);
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#endif
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+ } else if (!strncmp(command, "flush-cache", len)) {
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+ fprintf(logfile, "dm-command: flush caches\n");
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+ qemu_invalidate_map_cache();
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} else {
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fprintf(logfile, "dm-command: unknown command\"%*s\"\n", len, command);
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}
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