From: Liang Li <liang.z.li@intel.com> To: mst@redhat.com Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org, dgilbert@redhat.com, quintela@redhat.com, Liang Li <liang.z.li@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mgorman@techsingularity.net>, Paolo Bonzini <pbonzini@redhat.com>, Cornelia Huck <cornelia.huck@de.ibm.com>, Amit Shah <amit.shah@redhat.com> Subject: [PATCH v2 kernel 6/7] mm: add the related functions to get free page info Date: Wed, 29 Jun 2016 18:32:19 +0800 [thread overview] Message-ID: <1467196340-22079-7-git-send-email-liang.z.li@intel.com> (raw) In-Reply-To: <1467196340-22079-1-git-send-email-liang.z.li@intel.com> Save the free page info into a page bitmap, will be used in virtio balloon device driver. Signed-off-by: Liang Li <liang.z.li@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Amit Shah <amit.shah@redhat.com> --- mm/page_alloc.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2083b40..c2a6669 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4521,6 +4521,52 @@ unsigned long get_max_pfn(void) } EXPORT_SYMBOL(get_max_pfn); +static void mark_free_pages_bitmap(struct zone *zone, unsigned long start_pfn, + unsigned long end_pfn, unsigned long *bitmap, unsigned long len) +{ + unsigned long pfn, flags, page_num; + unsigned int order, t; + struct list_head *curr; + + if (zone_is_empty(zone)) + return; + end_pfn = min(start_pfn + len, end_pfn); + spin_lock_irqsave(&zone->lock, flags); + + for_each_migratetype_order(order, t) { + list_for_each(curr, &zone->free_area[order].free_list[t]) { + pfn = page_to_pfn(list_entry(curr, struct page, lru)); + if (pfn >= start_pfn && pfn <= end_pfn) { + page_num = 1UL << order; + if (pfn + page_num > end_pfn) + page_num = end_pfn - pfn; + bitmap_set(bitmap, pfn - start_pfn, page_num); + } + } + } + + spin_unlock_irqrestore(&zone->lock, flags); +} + +int get_free_pages(unsigned long start_pfn, unsigned long end_pfn, + unsigned long *bitmap, unsigned long len) +{ + struct zone *zone; + int ret = 0; + + if (bitmap == NULL || start_pfn > end_pfn || start_pfn >= max_pfn) + return 0; + if (end_pfn < max_pfn) + ret = 1; + if (end_pfn >= max_pfn) + ret = 0; + + for_each_populated_zone(zone) + mark_free_pages_bitmap(zone, start_pfn, end_pfn, bitmap, len); + return ret; +} +EXPORT_SYMBOL(get_free_pages); + static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) { zoneref->zone = zone; -- 1.8.3.1
WARNING: multiple messages have this Message-ID (diff)
From: Liang Li <liang.z.li@intel.com> To: mst@redhat.com Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org, dgilbert@redhat.com, quintela@redhat.com, Liang Li <liang.z.li@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mgorman@techsingularity.net>, Paolo Bonzini <pbonzini@redhat.com>, Cornelia Huck <cornelia.huck@de.ibm.com>, Amit Shah <amit.shah@redhat.com> Subject: [Qemu-devel] [PATCH v2 kernel 6/7] mm: add the related functions to get free page info Date: Wed, 29 Jun 2016 18:32:19 +0800 [thread overview] Message-ID: <1467196340-22079-7-git-send-email-liang.z.li@intel.com> (raw) In-Reply-To: <1467196340-22079-1-git-send-email-liang.z.li@intel.com> Save the free page info into a page bitmap, will be used in virtio balloon device driver. Signed-off-by: Liang Li <liang.z.li@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Amit Shah <amit.shah@redhat.com> --- mm/page_alloc.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2083b40..c2a6669 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4521,6 +4521,52 @@ unsigned long get_max_pfn(void) } EXPORT_SYMBOL(get_max_pfn); +static void mark_free_pages_bitmap(struct zone *zone, unsigned long start_pfn, + unsigned long end_pfn, unsigned long *bitmap, unsigned long len) +{ + unsigned long pfn, flags, page_num; + unsigned int order, t; + struct list_head *curr; + + if (zone_is_empty(zone)) + return; + end_pfn = min(start_pfn + len, end_pfn); + spin_lock_irqsave(&zone->lock, flags); + + for_each_migratetype_order(order, t) { + list_for_each(curr, &zone->free_area[order].free_list[t]) { + pfn = page_to_pfn(list_entry(curr, struct page, lru)); + if (pfn >= start_pfn && pfn <= end_pfn) { + page_num = 1UL << order; + if (pfn + page_num > end_pfn) + page_num = end_pfn - pfn; + bitmap_set(bitmap, pfn - start_pfn, page_num); + } + } + } + + spin_unlock_irqrestore(&zone->lock, flags); +} + +int get_free_pages(unsigned long start_pfn, unsigned long end_pfn, + unsigned long *bitmap, unsigned long len) +{ + struct zone *zone; + int ret = 0; + + if (bitmap == NULL || start_pfn > end_pfn || start_pfn >= max_pfn) + return 0; + if (end_pfn < max_pfn) + ret = 1; + if (end_pfn >= max_pfn) + ret = 0; + + for_each_populated_zone(zone) + mark_free_pages_bitmap(zone, start_pfn, end_pfn, bitmap, len); + return ret; +} +EXPORT_SYMBOL(get_free_pages); + static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) { zoneref->zone = zone; -- 1.8.3.1
next prev parent reply other threads:[~2016-06-29 10:40 UTC|newest] Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-06-29 10:32 [PATCH v2 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration Liang Li 2016-06-29 10:32 ` [Qemu-devel] " Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` [PATCH v2 kernel 1/7] virtio-balloon: rework deflate to add page to a list Liang Li 2016-06-29 10:32 ` [Qemu-devel] " Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` [PATCH v2 kernel 2/7] virtio-balloon: define new feature bit and page bitmap head Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` [Qemu-devel] " Liang Li 2016-06-29 10:32 ` [PATCH v2 kernel 3/7] mm: add a function to get the max pfn Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` [Qemu-devel] " Liang Li 2016-06-29 10:32 ` [PATCH v2 kernel 4/7] virtio-balloon: speed up inflate/deflate process Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` [Qemu-devel] " Liang Li 2016-06-29 10:32 ` [PATCH v2 kernel 5/7] virtio-balloon: define feature bit and head for misc virt queue Liang Li 2016-06-29 10:32 ` [Qemu-devel] " Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` Liang Li [this message] 2016-06-29 10:32 ` [Qemu-devel] [PATCH v2 kernel 6/7] mm: add the related functions to get free page info Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` [PATCH v2 kernel 7/7] virtio-balloon: tell host vm's " Liang Li 2016-06-29 10:32 ` Liang Li 2016-06-29 10:32 ` [Qemu-devel] " Liang Li 2016-07-06 0:43 ` [PATCH v2 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration Li, Liang Z 2016-07-06 0:43 ` Li, Liang Z 2016-07-06 0:43 ` [Qemu-devel] " Li, Liang Z 2016-07-06 0:43 ` Li, Liang Z 2016-07-21 8:14 ` Li, Liang Z 2016-07-21 8:14 ` Li, Liang Z 2016-07-21 8:14 ` [Qemu-devel] " Li, Liang Z 2016-07-21 8:14 ` Li, Liang Z 2016-07-26 18:55 ` Michael S. Tsirkin 2016-07-26 18:55 ` [Qemu-devel] " Michael S. Tsirkin 2016-07-26 18:55 ` Michael S. Tsirkin 2016-07-27 1:32 ` [virtio-dev] " Li, Liang Z 2016-07-27 1:32 ` Li, Liang Z 2016-07-27 1:32 ` [Qemu-devel] " Li, Liang Z 2016-07-27 1:32 ` Li, Liang Z 2016-07-27 1:32 ` Li, Liang Z 2016-07-26 18:55 ` Michael S. Tsirkin
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