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...ESSA_CSTATE_MASK 0x03 +#define ESSA_CSTATE_RESIDENT 0x00 +#define ESSA_CSTATE_PRESERVED 0x02 +#define ESSA_CSTATE_ZERO 0x03 + +extern struct page *mem_map; + +/* + * ESSA <rc-reg>,<page-address-reg>,<command-immediate> + */ +#define page_essa(_page,_command) ({ \ + int _rc; \ + asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0" \ + : "=&d" (_rc) : "a" (((_page)-mem_map)<<PAGE_SHIFT), \ + "i" (_command)); \ + _rc; \ +}) + +static inline void page_set_unused(struct page *page, int order) +{ + int i; + + if (!M...

...ESSA_CSTATE_MASK 0x03 +#define ESSA_CSTATE_RESIDENT 0x00 +#define ESSA_CSTATE_PRESERVED 0x02 +#define ESSA_CSTATE_ZERO 0x03 + +extern struct page *mem_map; + +/* + * ESSA <rc-reg>,<page-address-reg>,<command-immediate> + */ +#define page_essa(_page,_command) ({ \ + int _rc; \ + asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0" \ + : "=&d" (_rc) : "a" (((_page)-mem_map)<<PAGE_SHIFT), \ + "i" (_command)); \ + _rc; \ +}) + +static inline void page_set_unused(struct page *page, int order) +{ + int i; + + if (!M...

Creating a btrfs file system using btrfs-progs-0.20.rc1.20130308git704a08c-1.fc19, and either kernel 3.6.10-4.fc18 or 3.9.0-0.rc3.git0.3.fc19, makes a file system that cannot be mounted by kernel 3.6.10-4.fc18. It can be mounted by kernel 3.8.4. I haven''t tested any other 3.8, or any 3.7 kernels. Is this expected? dmesg reports: [ 300.014764] btrfs: disk space caching is enabled [

...first to members of a grant entry are updated as a combined + * pair. The following union allows that to happen in an endian + * neutral fashion. */ +union grant_combo { + uint32_t word; + struct { + uint16_t flags; + domid_t domid; + } shorts; +}; + #define PIN_FAIL(_lbl, _rc, _f, _a...) \ do { \ DPRINTK( _f, ## _a ); \ @@ -177,7 +188,7 @@ __gnttab_map_grant_ref( */ for ( ; ; ) { - u32 scombo, prev_scombo, new_scombo; + union grant_combo scom...

...n vgonel (vp=0xfffffe0035273000) at vnode_if.h:830 td = (struct thread *) 0xfffffe008be0b000 active = 1 mp = (struct mount *) 0x0 #15 0xffffffff809ae1de in vflush (mp=0xfffffe00048ae338, rootrefs=1, flags=2, td=0xfffffe008be0b000) at /usr/src/sys/kern/vfs_subr.c:2687 _rc = <value optimized out> vp = (struct vnode *) 0xfffffe0035273000 mvp = (struct vnode *) 0xfffffe008bc36800 rootvp = (struct vnode *) 0xfffffe0035273000 vattr = {va_type = 2175779674, va_mode = 65535, va_nlink = -1, va_uid = 689, va_gid = 0, va_fsid = 3889432544...

...include/asm-s390/page-states.h linux-2.6-patched/include/asm-s390/page-states.h --- linux-2.6/include/asm-s390/page-states.h 2006-09-01 12:49:36.000000000 +0200 +++ linux-2.6-patched/include/asm-s390/page-states.h 2006-09-01 12:50:25.000000000 +0200 @@ -33,6 +33,22 @@ extern struct page *mem_map; _rc; \ }) +static inline int page_host_discards(void) +{ + return MACHINE_HAS_ESSA; +} + +static inline int page_discarded(struct page *page) +{ + int state; + + if (!MACHINE_HAS_ESSA) + return 0; + state = page_essa(page, ESSA_GET_STATE); + return (state & ESSA_USTATE_MASK) == ESSA_USTATE_VOLA...

...include/asm-s390/page-states.h linux-2.6-patched/include/asm-s390/page-states.h --- linux-2.6/include/asm-s390/page-states.h 2006-09-01 12:49:36.000000000 +0200 +++ linux-2.6-patched/include/asm-s390/page-states.h 2006-09-01 12:50:25.000000000 +0200 @@ -33,6 +33,22 @@ extern struct page *mem_map; _rc; \ }) +static inline int page_host_discards(void) +{ + return MACHINE_HAS_ESSA; +} + +static inline int page_discarded(struct page *page) +{ + int state; + + if (!MACHINE_HAS_ESSA) + return 0; + state = page_essa(page, ESSA_GET_STATE); + return (state & ESSA_USTATE_MASK) == ESSA_USTATE_VOLA...

Greetings, after Carsten pitched CMM2 on the kvm mini summit here is a repost of version 5 of the guest page hinting patches. The code is still the same but has been adapted to the latest git level. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin.

Greetings, after Carsten pitched CMM2 on the kvm mini summit here is a repost of version 5 of the guest page hinting patches. The code is still the same but has been adapted to the latest git level. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin.

After way to many months here is the fifth version of the guest page hinting patches. Compared to version four a few improvements have been added: - Avoid page_host_discards() calls outside of page-states.h - The discard list is now implemented via the page_free_discarded hook and architecture specific code. - PG_state_change page flag has been replaced with architecture specficic

After way to many months here is the fifth version of the guest page hinting patches. Compared to version four a few improvements have been added: - Avoid page_host_discards() calls outside of page-states.h - The discard list is now implemented via the page_free_discarded hook and architecture specific code. - PG_state_change page flag has been replaced with architecture specficic

This patch series is a reworking of a series developed by Mukesh Rathor at Oracle. The entirety of the design and development was done by him; I have only reworked, reorganized, and simplified things in a way that I think makes more sense. The vast majority of the credit for this effort therefore goes to him. This version is labelled v13 because it is based on his most recent series, v11.

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