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Diffstat (limited to 'exa/exa_migration_classic.c')
| -rw-r--r-- | exa/exa_migration_classic.c | 720 |
1 files changed, 720 insertions, 0 deletions
diff --git a/exa/exa_migration_classic.c b/exa/exa_migration_classic.c new file mode 100644 index 000000000..d8e1e86da --- /dev/null +++ b/exa/exa_migration_classic.c @@ -0,0 +1,720 @@ +/* + * Copyright © 2006 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Authors: + * Eric Anholt <eric@anholt.net> + * Michel Dänzer <michel@tungstengraphics.com> + * + */ + +#ifdef HAVE_DIX_CONFIG_H +#include <dix-config.h> +#endif + +#include <string.h> + +#include "exa_priv.h" +#include "exa.h" + +#if DEBUG_MIGRATE +#define DBG_MIGRATE(a) ErrorF a +#else +#define DBG_MIGRATE(a) +#endif + +/** + * The fallback path for UTS/DFS failing is to just memcpy. exaCopyDirtyToSys + * and exaCopyDirtyToFb both needed to do this loop. + */ +static void +exaMemcpyBox (PixmapPtr pPixmap, BoxPtr pbox, CARD8 *src, int src_pitch, + CARD8 *dst, int dst_pitch) + { + int i, cpp = pPixmap->drawable.bitsPerPixel / 8; + int bytes = (pbox->x2 - pbox->x1) * cpp; + + src += pbox->y1 * src_pitch + pbox->x1 * cpp; + dst += pbox->y1 * dst_pitch + pbox->x1 * cpp; + + for (i = pbox->y2 - pbox->y1; i; i--) { + memcpy (dst, src, bytes); + src += src_pitch; + dst += dst_pitch; + } +} + +/** + * Returns TRUE if the pixmap is dirty (has been modified in its current + * location compared to the other), or lacks a private for tracking + * dirtiness. + */ +static Bool +exaPixmapIsDirty (PixmapPtr pPix) +{ + ExaPixmapPriv (pPix); + + if (pExaPixmap == NULL) + EXA_FatalErrorDebugWithRet(("EXA bug: exaPixmapIsDirty was called on a non-exa pixmap.\n"), TRUE); + + return REGION_NOTEMPTY (pScreen, DamageRegion(pExaPixmap->pDamage)) || + !REGION_EQUAL(pScreen, &pExaPixmap->validSys, &pExaPixmap->validFB); +} + +/** + * Returns TRUE if the pixmap is either pinned in FB, or has a sufficient score + * to be considered "should be in framebuffer". That's just anything that has + * had more acceleration than fallbacks, or has no score yet. + * + * Only valid if using a migration scheme that tracks score. + */ +static Bool +exaPixmapShouldBeInFB (PixmapPtr pPix) +{ + ExaPixmapPriv (pPix); + + if (exaPixmapIsPinned (pPix)) + return TRUE; + + return pExaPixmap->score >= 0; +} + +/** + * If the pixmap is currently dirty, this copies at least the dirty area from + * FB to system or vice versa. Both areas must be allocated. + */ +static void +exaCopyDirty(ExaMigrationPtr migrate, RegionPtr pValidDst, RegionPtr pValidSrc, + Bool (*transfer) (PixmapPtr pPix, int x, int y, int w, int h, + char *sys, int sys_pitch), CARD8 *fallback_src, + CARD8 *fallback_dst, int fallback_srcpitch, int fallback_dstpitch, + int fallback_index, void (*sync) (ScreenPtr pScreen)) +{ + PixmapPtr pPixmap = migrate->pPix; + ExaPixmapPriv (pPixmap); + RegionPtr damage = DamageRegion (pExaPixmap->pDamage); + RegionRec CopyReg; + Bool save_offscreen; + int save_pitch; + BoxPtr pBox; + int nbox; + Bool access_prepared = FALSE; + Bool need_sync = FALSE; + + /* Damaged bits are valid in current copy but invalid in other one */ + if (exaPixmapIsOffscreen(pPixmap)) { + REGION_UNION(pScreen, &pExaPixmap->validFB, &pExaPixmap->validFB, + damage); + REGION_SUBTRACT(pScreen, &pExaPixmap->validSys, &pExaPixmap->validSys, + damage); + } else { + REGION_UNION(pScreen, &pExaPixmap->validSys, &pExaPixmap->validSys, + damage); + REGION_SUBTRACT(pScreen, &pExaPixmap->validFB, &pExaPixmap->validFB, + damage); + } + + REGION_EMPTY(pScreen, damage); + + /* Copy bits valid in source but not in destination */ + REGION_NULL(pScreen, &CopyReg); + REGION_SUBTRACT(pScreen, &CopyReg, pValidSrc, pValidDst); + + if (migrate->as_dst) { + ExaScreenPriv (pPixmap->drawable.pScreen); + + /* XXX: The pending damage region will be marked as damaged after the + * operation, so it should serve as an upper bound for the region that + * needs to be synchronized for the operation. Unfortunately, this + * causes corruption in some cases, e.g. when starting compiz. See + * https://bugs.freedesktop.org/show_bug.cgi?id=12916 . + */ + if (pExaScr->optimize_migration) { + RegionPtr pending_damage = DamagePendingRegion(pExaPixmap->pDamage); + +#if DEBUG_MIGRATE + if (REGION_NIL(pending_damage)) { + static Bool firsttime = TRUE; + + if (firsttime) { + ErrorF("%s: Pending damage region empty!\n", __func__); + firsttime = FALSE; + } + } +#endif + + /* Try to prevent destination valid region from growing too many + * rects by filling it up to the extents of the union of the + * destination valid region and the pending damage region. + */ + if (REGION_NUM_RECTS(pValidDst) > 10) { + BoxRec box; + BoxPtr pValidExt, pDamageExt; + RegionRec closure; + + pValidExt = REGION_EXTENTS(pScreen, pValidDst); + pDamageExt = REGION_EXTENTS(pScreen, pending_damage); + + box.x1 = min(pValidExt->x1, pDamageExt->x1); + box.y1 = min(pValidExt->y1, pDamageExt->y1); + box.x2 = max(pValidExt->x2, pDamageExt->x2); + box.y2 = max(pValidExt->y2, pDamageExt->y2); + + REGION_INIT(pScreen, &closure, &box, 0); + REGION_INTERSECT(pScreen, &CopyReg, &CopyReg, &closure); + } else + REGION_INTERSECT(pScreen, &CopyReg, &CopyReg, pending_damage); + } + + /* The caller may provide a region to be subtracted from the calculated + * dirty region. This is to avoid migration of bits that don't + * contribute to the result of the operation. + */ + if (migrate->pReg) + REGION_SUBTRACT(pScreen, &CopyReg, &CopyReg, migrate->pReg); + } else { + /* The caller may restrict the region to be migrated for source pixmaps + * to what's relevant for the operation. + */ + if (migrate->pReg) + REGION_INTERSECT(pScreen, &CopyReg, &CopyReg, migrate->pReg); + } + + pBox = REGION_RECTS(&CopyReg); + nbox = REGION_NUM_RECTS(&CopyReg); + + save_offscreen = pExaPixmap->offscreen; + save_pitch = pPixmap->devKind; + pExaPixmap->offscreen = TRUE; + pPixmap->devKind = pExaPixmap->fb_pitch; + + while (nbox--) { + pBox->x1 = max(pBox->x1, 0); + pBox->y1 = max(pBox->y1, 0); + pBox->x2 = min(pBox->x2, pPixmap->drawable.width); + pBox->y2 = min(pBox->y2, pPixmap->drawable.height); + + if (pBox->x1 >= pBox->x2 || pBox->y1 >= pBox->y2) + continue; + + if (!transfer || !transfer (pPixmap, + pBox->x1, pBox->y1, + pBox->x2 - pBox->x1, + pBox->y2 - pBox->y1, + (char *) (pExaPixmap->sys_ptr + + pBox->y1 * pExaPixmap->sys_pitch + + pBox->x1 * pPixmap->drawable.bitsPerPixel / 8), + pExaPixmap->sys_pitch)) + { + if (!access_prepared) { + ExaDoPrepareAccess(&pPixmap->drawable, fallback_index); + access_prepared = TRUE; + } + exaMemcpyBox (pPixmap, pBox, + fallback_src, fallback_srcpitch, + fallback_dst, fallback_dstpitch); + } else + need_sync = TRUE; + + pBox++; + } + + if (access_prepared) + exaFinishAccess(&pPixmap->drawable, fallback_index); + else if (need_sync && sync) + sync (pPixmap->drawable.pScreen); + + pExaPixmap->offscreen = save_offscreen; + pPixmap->devKind = save_pitch; + + /* Try to prevent source valid region from growing too many rects by + * removing parts of it which are also in the destination valid region. + * Removing anything beyond that would lead to data loss. + */ + if (REGION_NUM_RECTS(pValidSrc) > 20) + REGION_SUBTRACT(pScreen, pValidSrc, pValidSrc, pValidDst); + + /* The copied bits are now valid in destination */ + REGION_UNION(pScreen, pValidDst, pValidDst, &CopyReg); + + REGION_UNINIT(pScreen, &CopyReg); +} + +/** + * If the pixmap is currently dirty, this copies at least the dirty area from + * the framebuffer memory copy to the system memory copy. Both areas must be + * allocated. + */ +static void +exaCopyDirtyToSys (ExaMigrationPtr migrate) +{ + PixmapPtr pPixmap = migrate->pPix; + ExaScreenPriv (pPixmap->drawable.pScreen); + ExaPixmapPriv (pPixmap); + + exaCopyDirty(migrate, &pExaPixmap->validSys, &pExaPixmap->validFB, + pExaScr->info->DownloadFromScreen, pExaPixmap->fb_ptr, + pExaPixmap->sys_ptr, pExaPixmap->fb_pitch, + pExaPixmap->sys_pitch, EXA_PREPARE_SRC, exaWaitSync); +} + +/** + * If the pixmap is currently dirty, this copies at least the dirty area from + * the system memory copy to the framebuffer memory copy. Both areas must be + * allocated. + */ +static void +exaCopyDirtyToFb (ExaMigrationPtr migrate) +{ + PixmapPtr pPixmap = migrate->pPix; + ExaScreenPriv (pPixmap->drawable.pScreen); + ExaPixmapPriv (pPixmap); + + exaCopyDirty(migrate, &pExaPixmap->validFB, &pExaPixmap->validSys, + pExaScr->info->UploadToScreen, pExaPixmap->sys_ptr, + pExaPixmap->fb_ptr, pExaPixmap->sys_pitch, + pExaPixmap->fb_pitch, EXA_PREPARE_DEST, NULL); +} + +/** + * Allocates a framebuffer copy of the pixmap if necessary, and then copies + * any necessary pixmap data into the framebuffer copy and points the pixmap at + * it. + * + * Note that when first allocated, a pixmap will have FALSE dirty flag. + * This is intentional because pixmap data starts out undefined. So if we move + * it in due to the first operation against it being accelerated, it will have + * undefined framebuffer contents that we didn't have to upload. If we do + * moveouts (and moveins) after the first movein, then we will only have to copy + * back and forth if the pixmap was written to after the last synchronization of + * the two copies. Then, at exaPixmapSave (when the framebuffer copy goes away) + * we mark the pixmap dirty, so that the next exaMoveInPixmap will actually move + * all the data, since it's almost surely all valid now. + */ +static void +exaDoMoveInPixmap (ExaMigrationPtr migrate) +{ + PixmapPtr pPixmap = migrate->pPix; + ScreenPtr pScreen = pPixmap->drawable.pScreen; + ExaScreenPriv (pScreen); + ExaPixmapPriv (pPixmap); + + /* If we're VT-switched away, no touching card memory allowed. */ + if (pExaScr->swappedOut) + return; + + /* If we're not allowed to move, then fail. */ + if (exaPixmapIsPinned(pPixmap)) + return; + + /* Don't migrate in pixmaps which are less than 8bpp. This avoids a lot of + * fragility in EXA, and <8bpp is probably not used enough any more to care + * (at least, not in acceleratd paths). + */ + if (pPixmap->drawable.bitsPerPixel < 8) + return; + + if (pExaPixmap->accel_blocked) + return; + + if (pExaPixmap->area == NULL) { + pExaPixmap->area = + exaOffscreenAlloc (pScreen, pExaPixmap->fb_size, + pExaScr->info->pixmapOffsetAlign, FALSE, + exaPixmapSave, (pointer) pPixmap); + if (pExaPixmap->area == NULL) + return; + + pExaPixmap->fb_ptr = (CARD8 *) pExaScr->info->memoryBase + + pExaPixmap->area->offset; + } + + exaCopyDirtyToFb (migrate); + + if (exaPixmapIsOffscreen(pPixmap)) + return; + + DBG_MIGRATE (("-> %p (0x%x) (%dx%d) (%c)\n", pPixmap, + (ExaGetPixmapPriv(pPixmap)->area ? + ExaGetPixmapPriv(pPixmap)->area->offset : 0), + pPixmap->drawable.width, + pPixmap->drawable.height, + exaPixmapIsDirty(pPixmap) ? 'd' : 'c')); + + pExaPixmap->offscreen = TRUE; + + pPixmap->devKind = pExaPixmap->fb_pitch; + pPixmap->drawable.serialNumber = NEXT_SERIAL_NUMBER; +} + +void +exaMoveInPixmap_classic (PixmapPtr pPixmap) +{ + static ExaMigrationRec migrate = { .as_dst = FALSE, .as_src = TRUE, + .pReg = NULL }; + + migrate.pPix = pPixmap; + exaDoMoveInPixmap (&migrate); +} + +/** + * Switches the current active location of the pixmap to system memory, copying + * updated data out if necessary. + */ +static void +exaDoMoveOutPixmap (ExaMigrationPtr migrate) +{ + PixmapPtr pPixmap = migrate->pPix; + ExaPixmapPriv (pPixmap); + + if (!pExaPixmap->area || exaPixmapIsPinned(pPixmap)) + return; + + exaCopyDirtyToSys (migrate); + + if (exaPixmapIsOffscreen(pPixmap)) { + + DBG_MIGRATE (("<- %p (%p) (%dx%d) (%c)\n", pPixmap, + (void*)(ExaGetPixmapPriv(pPixmap)->area ? + ExaGetPixmapPriv(pPixmap)->area->offset : 0), + pPixmap->drawable.width, + pPixmap->drawable.height, + exaPixmapIsDirty(pPixmap) ? 'd' : 'c')); + + pExaPixmap->offscreen = FALSE; + + pPixmap->devKind = pExaPixmap->sys_pitch; + pPixmap->drawable.serialNumber = NEXT_SERIAL_NUMBER; + } +} + +void +exaMoveOutPixmap_classic (PixmapPtr pPixmap) +{ + static ExaMigrationRec migrate = { .as_dst = FALSE, .as_src = TRUE, + .pReg = NULL }; + + migrate.pPix = pPixmap; + exaDoMoveOutPixmap (&migrate); +} + + +/** + * Copies out important pixmap data and removes references to framebuffer area. + * Called when the memory manager decides it's time to kick the pixmap out of + * framebuffer entirely. + */ +void +exaPixmapSave (ScreenPtr pScreen, ExaOffscreenArea *area) +{ + PixmapPtr pPixmap = area->privData; + ExaPixmapPriv(pPixmap); + + exaMoveOutPixmap(pPixmap); + + pExaPixmap->fb_ptr = NULL; + pExaPixmap->area = NULL; + + /* Mark all FB bits as invalid, so all valid system bits get copied to FB + * next time */ + REGION_EMPTY(pPixmap->drawable.pScreen, &pExaPixmap->validFB); +} + +/** + * For the "greedy" migration scheme, pushes the pixmap toward being located in + * framebuffer memory. + */ +static void +exaMigrateTowardFb (ExaMigrationPtr migrate) +{ + PixmapPtr pPixmap = migrate->pPix; + ExaPixmapPriv (pPixmap); + + if (pExaPixmap->score == EXA_PIXMAP_SCORE_PINNED) { + DBG_MIGRATE(("UseScreen: not migrating pinned pixmap %p\n", + (pointer)pPixmap)); + return; + } + + DBG_MIGRATE(("UseScreen %p score %d\n", + (pointer)pPixmap, pExaPixmap->score)); + + if (pExaPixmap->score == EXA_PIXMAP_SCORE_INIT) { + exaDoMoveInPixmap(migrate); + pExaPixmap->score = 0; + } + + if (pExaPixmap->score < EXA_PIXMAP_SCORE_MAX) + pExaPixmap->score++; + + if (pExaPixmap->score >= EXA_PIXMAP_SCORE_MOVE_IN && + !exaPixmapIsOffscreen(pPixmap)) + { + exaDoMoveInPixmap(migrate); + } + + if (exaPixmapIsOffscreen(pPixmap)) { + exaCopyDirtyToFb (migrate); + ExaOffscreenMarkUsed (pPixmap); + } else + exaCopyDirtyToSys (migrate); +} + +/** + * For the "greedy" migration scheme, pushes the pixmap toward being located in + * system memory. + */ +static void +exaMigrateTowardSys (ExaMigrationPtr migrate) +{ + PixmapPtr pPixmap = migrate->pPix; + ExaPixmapPriv (pPixmap); + + DBG_MIGRATE(("UseMem: %p score %d\n", (pointer)pPixmap, pExaPixmap->score)); + + if (pExaPixmap->score == EXA_PIXMAP_SCORE_PINNED) + return; + + if (pExaPixmap->score == EXA_PIXMAP_SCORE_INIT) + pExaPixmap->score = 0; + + if (pExaPixmap->score > EXA_PIXMAP_SCORE_MIN) + pExaPixmap->score--; + + if (pExaPixmap->score <= EXA_PIXMAP_SCORE_MOVE_OUT && pExaPixmap->area) + exaDoMoveOutPixmap(migrate); + + if (exaPixmapIsOffscreen(pPixmap)) { + exaCopyDirtyToFb (migrate); + ExaOffscreenMarkUsed (pPixmap); + } else + exaCopyDirtyToSys (migrate); +} + +/** + * If the pixmap has both a framebuffer and system memory copy, this function + * asserts that both of them are the same. + */ +static Bool +exaAssertNotDirty (PixmapPtr pPixmap) +{ + ExaPixmapPriv (pPixmap); + CARD8 *dst, *src; + RegionRec ValidReg; + int dst_pitch, src_pitch, cpp, y, nbox, save_pitch; + BoxPtr pBox; + Bool ret = TRUE, save_offscreen; + + if (exaPixmapIsPinned(pPixmap) || pExaPixmap->area == NULL) + return ret; + + REGION_NULL(pScreen, &ValidReg); + REGION_INTERSECT(pScreen, &ValidReg, &pExaPixmap->validFB, + &pExaPixmap->validSys); + nbox = REGION_NUM_RECTS(&ValidReg); + + if (!nbox) + goto out; + + pBox = REGION_RECTS(&ValidReg); + + dst_pitch = pExaPixmap->sys_pitch; + src_pitch = pExaPixmap->fb_pitch; + cpp = pPixmap->drawable.bitsPerPixel / 8; + + save_offscreen = pExaPixmap->offscreen; + save_pitch = pPixmap->devKind; + pExaPixmap->offscreen = TRUE; + pPixmap->devKind = pExaPixmap->fb_pitch; + + if (!ExaDoPrepareAccess(&pPixmap->drawable, EXA_PREPARE_SRC)) + goto skip; + + while (nbox--) { + int rowbytes; + + pBox->x1 = max(pBox->x1, 0); + pBox->y1 = max(pBox->y1, 0); + pBox->x2 = min(pBox->x2, pPixmap->drawable.width); + pBox->y2 = min(pBox->y2, pPixmap->drawable.height); + + if (pBox->x1 >= pBox->x2 || pBox->y1 >= pBox->y2) + continue; + + rowbytes = (pBox->x2 - pBox->x1) * cpp; + src = (CARD8 *) pPixmap->devPrivate.ptr + pBox->y1 * src_pitch + pBox->x1 * cpp; + dst = pExaPixmap->sys_ptr + pBox->y1 * dst_pitch + pBox->x1 * cpp; + + for (y = pBox->y1; y < pBox->y2; + y++, src += src_pitch, dst += dst_pitch) { + if (memcmp(dst, src, rowbytes) != 0) { + ret = FALSE; + exaPixmapDirty(pPixmap, pBox->x1, pBox->y1, pBox->x2, + pBox->y2); + break; + } + } + } + +skip: + exaFinishAccess(&pPixmap->drawable, EXA_PREPARE_SRC); + + pExaPixmap->offscreen = save_offscreen; + pPixmap->devKind = save_pitch; + +out: + REGION_UNINIT(pScreen, &ValidReg); + return ret; +} + +/** + * Performs migration of the pixmaps according to the operation information + * provided in pixmaps and can_accel and the migration scheme chosen in the + * config file. + */ +void +exaDoMigration_classic (ExaMigrationPtr pixmaps, int npixmaps, Bool can_accel) +{ + ScreenPtr pScreen = pixmaps[0].pPix->drawable.pScreen; + ExaScreenPriv(pScreen); + int i, j; + + /* If this debugging flag is set, check each pixmap for whether it is marked + * as clean, and if so, actually check if that's the case. This should help + * catch issues with failing to mark a drawable as dirty. While it will + * catch them late (after the operation happened), it at least explains what + * went wrong, and instrumenting the code to find what operation happened + * to the pixmap last shouldn't be hard. + */ + if (pExaScr->checkDirtyCorrectness) { + for (i = 0; i < npixmaps; i++) { + if (!exaPixmapIsDirty (pixmaps[i].pPix) && + !exaAssertNotDirty (pixmaps[i].pPix)) + ErrorF("%s: Pixmap %d dirty but not marked as such!\n", __func__, i); + } + } + /* If anything is pinned in system memory, we won't be able to + * accelerate. + */ + for (i = 0; i < npixmaps; i++) { + if (exaPixmapIsPinned (pixmaps[i].pPix) && + !exaPixmapIsOffscreen (pixmaps[i].pPix)) + { + EXA_FALLBACK(("Pixmap %p (%dx%d) pinned in sys\n", pixmaps[i].pPix, + pixmaps[i].pPix->drawable.width, + pixmaps[i].pPix->drawable.height)); + can_accel = FALSE; + break; + } + } + + if (pExaScr->migration == ExaMigrationSmart) { + /* If we've got something as a destination that we shouldn't cause to + * become newly dirtied, take the unaccelerated route. + */ + for (i = 0; i < npixmaps; i++) { + if (pixmaps[i].as_dst && !exaPixmapShouldBeInFB (pixmaps[i].pPix) && + !exaPixmapIsDirty (pixmaps[i].pPix)) + { + for (i = 0; i < npixmaps; i++) { + if (!exaPixmapIsDirty (pixmaps[i].pPix)) + exaDoMoveOutPixmap (pixmaps + i); + } + return; + } + } + + /* If we aren't going to accelerate, then we migrate everybody toward + * system memory, and kick out if it's free. + */ + if (!can_accel) { + for (i = 0; i < npixmaps; i++) { + exaMigrateTowardSys (pixmaps + i); + if (!exaPixmapIsDirty (pixmaps[i].pPix)) + exaDoMoveOutPixmap (pixmaps + i); + } + return; + } + + /* Finally, the acceleration path. Move them all in. */ + for (i = 0; i < npixmaps; i++) { + exaMigrateTowardFb(pixmaps + i); + exaDoMoveInPixmap(pixmaps + i); + } + } else if (pExaScr->migration == ExaMigrationGreedy) { + /* If we can't accelerate, either because the driver can't or because one of + * the pixmaps is pinned in system memory, then we migrate everybody toward + * system memory. + * + * We also migrate toward system if all pixmaps involved are currently in + * system memory -- this can mitigate thrashing when there are significantly + * more pixmaps active than would fit in memory. + * + * If not, then we migrate toward FB so that hopefully acceleration can + * happen. + */ + if (!can_accel) { + for (i = 0; i < npixmaps; i++) + exaMigrateTowardSys (pixmaps + i); + return; + } + + for (i = 0; i < npixmaps; i++) { + if (exaPixmapIsOffscreen(pixmaps[i].pPix)) { + /* Found one in FB, so move all to FB. */ + for (j = 0; j < npixmaps; j++) + exaMigrateTowardFb(pixmaps + i); + return; + } + } + + /* Nobody's in FB, so move all away from FB. */ + for (i = 0; i < npixmaps; i++) + exaMigrateTowardSys(pixmaps + i); + } else if (pExaScr->migration == ExaMigrationAlways) { + /* Always move the pixmaps out if we can't accelerate. If we can + * accelerate, try to move them all in. If that fails, then move them + * back out. + */ + if (!can_accel) { + for (i = 0; i < npixmaps; i++) + exaDoMoveOutPixmap(pixmaps + i); + return; + } + + /* Now, try to move them all into FB */ + for (i = 0; i < npixmaps; i++) { + exaDoMoveInPixmap(pixmaps + i); + } + + /* If we couldn't fit everything in, abort */ + for (i = 0; i < npixmaps; i++) { + if (!exaPixmapIsOffscreen(pixmaps[i].pPix)) { + return; + } + } + + /* Yay, everything's offscreen, mark memory as used */ + for (i = 0; i < npixmaps; i++) { + ExaOffscreenMarkUsed (pixmaps[i].pPix); + } + } +} |