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xen/events: fifo: Make it running on 64KB granularity

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Only use the first 4KB of the page to store the events channel info. It
means that we will waste 60KB every time we allocate page for:
     * control block: a page is allocating per CPU
     * event array: a page is allocating everytime we need to expand it

I think we can reduce the memory waste for the 2 areas by:

    * control block: sharing between multiple vCPUs. Although it will
    require some bookkeeping in order to not free the page when the CPU
    goes offline and the other CPUs sharing the page still there

    * event array: always extend the array event by 64K (i.e 16 4K
    chunk). That would require more care when we fail to expand the
    event channel.

Signed-off-by: Julien Grall <julien.grall@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Julien Grall 2015-05-05 16:37:30 +01:00 committed by David Vrabel
parent 30756c6299
commit a001c9d95c
2 changed files with 2 additions and 2 deletions
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2
drivers/xen/events/events_base.c
View File

@ -40,11 +40,11 @@
#include <asm/idle.h>
#include <asm/io_apic.h>
#include <asm/xen/pci.h>
#include <xen/page.h>
#endif
#include <asm/sync_bitops.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
#include <xen/page.h>
#include <xen/xen.h>
#include <xen/hvm.h>

2
drivers/xen/events/events_fifo.c
View File

@ -54,7 +54,7 @@
#include "events_internal.h"
#define EVENT_WORDS_PER_PAGE (PAGE_SIZE / sizeof(event_word_t))
#define EVENT_WORDS_PER_PAGE (XEN_PAGE_SIZE / sizeof(event_word_t))
#define MAX_EVENT_ARRAY_PAGES (EVTCHN_FIFO_NR_CHANNELS / EVENT_WORDS_PER_PAGE)
struct evtchn_fifo_queue {